I Solemnly Swear That I Am Up To No Good Shirt

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Size Guide

Size Chart

SIZE WIDTH LENGTH
S 18 in 28 in
M 20 in 29 in
L 22 in 30 in
XL 24 in 31 in
2XL 26 in 32 in
3XL 28 in 33 in
4XL 30 in 34 in
5XL 32 in 35 in
SC Unisex T Shirt
SC Unisex T Shirt
  • 5.3-ounce, 100% cotton (99/1 cotton/poly (Ash) & 90/10 cotton/poly (Sport Grey)
  • Heavyweight classic unisex tee
  • Taped neck and shoulders; Tearaway label
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
S 46 cm 71 cm
M 51 cm 74 cm
L 56 cm 76 cm
XL 61 cm 79 cm
2XL 66 cm 81 cm
3XL 71 cm 84 cm
4XL 76 cm 86 cm
5XL 81 cm 89 cm
SC Unisex T Shirt
  • 5.3-ounce, 100% cotton (99/1 cotton/poly (Ash) & 90/10 cotton/poly (Sport Grey)
  • Heavyweight classic unisex tee
  • Taped neck and shoulders; Tearaway label
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
S 17.25 in 25.5 in
M 19.25 in 26 in
L 21.25 in 27 in
XL 23.25 in 28 in
2XL 25.25 in 28.5 in
3XL 27.25 in 29 in
SC Ladies T Shirt
SC Ladies T Shirt
  • 100% preshrunk cotton; Ash Grey 99% cotton, 1% polyester
  • Feminine 1/2 inch rib mid scoop neck; sideseamed with slightly tapered Missy fit
  • Double-needle stitching throughout; seamless rib at neck
  • Decoration Type: Digital Print
SIZE WIDTH LENGTH
S 43.8 cm 64.8 cm
M 48.9 cm 66 cm
L 54 cm 68.6 cm
XL 59 cm 71 cm
2XL 64 cm 71.8 cm
3XL 69.2 cm 73.7 cm
SC Ladies T Shirt
  • 100% preshrunk cotton; Ash Grey 99% cotton, 1% polyester
  • Feminine 1/2 inch rib mid scoop neck; sideseamed with slightly tapered Missy fit
  • Double-needle stitching throughout; seamless rib at neck
  • Decoration Type: Digital Print
SIZE WIDTH LENGTH
S 20 in 26 in
M 22 in 27 in
L 24 in 28 in
XL 26 in 29 in
2XL 28 in 30 in
3XL 30 in 31 in
4XL 32 in 32 in
5XL 34 in 33 in
SC Sweatshirt
SC Sweatshirt
  • 8 oz; 55% cotton/45% polyester
  • Air jet yarn for a softer feel and no pilling
  • 1x1 athletic rib cuffs and waistband with spandex; Double-needle stitching
  • Care: Machine wash cold; Tumble dry low
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
S 50.8 cm 66 cm
M 55.9 cm 74 cm
L 68.6 cm 71 cm
XL 66 cm 73.7 cm
2XL 71 cm 76 cm
3XL 76.2 cm 78.7 cm
4XL 81.3 cm 81.3 cm
5XL 86.4 cm 83.8 cm
SC Sweatshirt
  • 8 oz; 55% cotton/45% polyester
  • Air jet yarn for a softer feel and no pilling
  • 1x1 athletic rib cuffs and waistband with spandex; Double-needle stitching
  • Care: Machine wash cold; Tumble dry low
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
S 20 in 26 in
M 22 in 27 in
L 24 in 28 in
XL 26 in 29 in
2XL 28 in 30 in
3XL 29 in 32 in
4XL 32 in 33 in
5XL 34 in 34 in
SC Hoodie
SC Hoodie
  • 5.3-ounce, 100% cotton (99/1 cotton/poly (Ash) & 90/10 cotton/poly (Sport Grey)
  • Heavyweight classic unisex tee
  • Taped neck and shoulders; Tearaway label
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
S 50.8 cm 66 cm
M 55.9 cm 74 cm
L 68.6 cm 71 cm
XL 66 cm 73.7 cm
2XL 71 cm 76 cm
3XL 73.7 cm 81.3 cm
4XL 81.3 cm 83.8 cm
5XL 86.4 cm 86.4 cm
SC Hoodie
  • 5.3-ounce, 100% cotton (99/1 cotton/poly (Ash) & 90/10 cotton/poly (Sport Grey)
  • Heavyweight classic unisex tee
  • Taped neck and shoulders; Tearaway label
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
S 18 in 28 in
M 20 in 29 in
L 22 in 30 in
XL 24 in 31 in
2XL 26 in 32 in
3XL 28 in 33 in
4XL 30 in 34 in
5XL 32 in 35 in
SC Long Sleeve T Shirt
SC Long Sleeve T Shirt
  • 5.3-ounce, 100% cotton (99/1 cotton/poly (Ash) & 90/10 cotton/poly (Sport Grey)
  • Heavyweight classic unisex tee
  • Taped neck and shoulders; Tearaway label
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
S 46 cm 71 cm
M 51 cm 74 cm
L 56 cm 76 cm
XL 61 cm 79 cm
2XL 66 cm 81 cm
3XL 71 cm 84 cm
4XL 76 cm 86 cm
5XL 81 cm 89 cm
SC Long Sleeve T Shirt
  • 5.3-ounce, 100% cotton (99/1 cotton/poly (Ash) & 90/10 cotton/poly (Sport Grey)
  • Heavyweight classic unisex tee
  • Taped neck and shoulders; Tearaway label
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
YXS 16 in 20.5 in
YS 17 in 22 in
YM 18 in 23.5 in
YL 19 in 25 in
YXL 20 in 26.5 in
SC Youth T Shirt
SC Youth T Shirt
  • 5.3-ounce, 100% cotton (99/1 cotton/poly (Ash) & 90/10 cotton/poly (Sport Grey)
  • Heavyweight classic unisex tee
  • Taped neck and shoulders; Tearaway label
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
YXS 40.6 cm 52 cm
YS 43.2 cm 55.9 cm
YM 45.7 cm 59.7 cm
YL 48.6 cm 63.5 cm
YXL 50.8 cm 67.3 cm
SC Youth T Shirt
  • 5.3-ounce, 100% cotton (99/1 cotton/poly (Ash) & 90/10 cotton/poly (Sport Grey)
  • Heavyweight classic unisex tee
  • Taped neck and shoulders; Tearaway label
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
XS 16 in 27 in
S 18 in 28 in
M 20 in 29 in
L 22 in 30 in
XL 24 in 31 in
2XL 26 in 32 in
3XL 28 in 33 in
SC Men Tank Top
SC Men Tank Top
  • 5.3-ounce, 100% cotton (99/1 cotton/poly (Ash) & 90/10 cotton/poly (Sport Grey)
  • Heavyweight classic unisex tee
  • Taped neck and shoulders; Tearaway label
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
XS 40.6 cm 68.6 cm
S 45.7 cm 71 cm
M 50.8 cm 73.6 cm
L 55.9 cm 76.2 cm
XL 61 cm 78.7 cm
2XL 71 cm 83.8 cm
3XL 81.3 cm 81.3 cm
SC Men Tank Top
  • 5.3-ounce, 100% cotton (99/1 cotton/poly (Ash) & 90/10 cotton/poly (Sport Grey)
  • Heavyweight classic unisex tee
  • Taped neck and shoulders; Tearaway label
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
XS 14 in 27 in
S 15 in 27.5 in
M 16 in 28 in
L 17 in 28.5 in
XL 18 in 29 in
2XL 19 in 29.5 in
SC Racerback Tank Top
SC Racerback Tank Top
  • 4 oz, 60% combed ring-spun cotton/40% polyester jersey
  • 30 singles
  • Fabric laundered for reduced shrinkage; Runs small, we suggest ordering up
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
XS 35.6 cm 68.6 cm
S 38 cm 69.8 cm
M 40.6 cm 71.1 cm
L 43.2 cm 72.4 cm
XL 45.7 cm 73.7 cm
2XL 48.3 cm 74.9 cm
SC Racerback Tank Top
  • 4 oz, 60% combed ring-spun cotton/40% polyester jersey
  • 30 singles
  • Fabric laundered for reduced shrinkage; Runs small, we suggest ordering up
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
YS 14 in 17 in
YM 16 in 19.5 in
YL 18.75 in 23 in
YXL 20.5 in 24.5 in
SC Youth Hoodie
SC Youth Hoodie
  • 7.75-ounce, 50% cotton, 50% polyester
  • No drawcord on kids' hoodies
  • We suggest ordering one or two sizes up for a fuller fit; Please refer to size chart for actual garment measurements
  • Decoration type: Digital Print
SIZE WIDTH LENGTH
YS 35.5 cm 43.2 cm
YM 40.6 cm 49.5 cm
YL 47.6 cm 58.4 cm
YXL 52.1 cm 62.2 cm
SC Youth Hoodie
  • 7.75-ounce, 50% cotton, 50% polyester
  • No drawcord on kids' hoodies
  • We suggest ordering one or two sizes up for a fuller fit; Please refer to size chart for actual garment measurements
  • Decoration type: Digital Print
  • $0.00
Quantity:

Estimated arrival: Place your order today (standard shipping method) to receive the product(s) within Mar 13 - Mar 18

Mar 04

Mar 06 - Mar 10

Mar 13 - Mar 18

SKU: TFDE9GPQ Categories: , ,

Are you ready to manage your mischief in style? The I Solemnly Swear That I Am Up To No Good Shirt is more than just apparel; it is a declaration of intent for witches, wizards, and muggles alike. In 2026, fandom fashion is all about making a statement, and nothing speaks louder than the spell that unlocks the secrets of the Marauder’s Map.

I Solemnly Swear That I Am Up To No Good Marauder’s Map Shirt  – Unlocking the Magic

This shirt is a visual homage to the cleverest pranksters to ever walk the halls of magical academia. The design features the legendary phrase “I Solemnly Swear That I Am Up To No Good” in a distressed, vintage-inspired font that evokes the parchment paper of an ancient, enchanted map. Complemented by subtle stars, flourishes, and a lightning bolt accent, the graphic is balanced and eye-catching without being overly loud.

This product is not merely a piece of clothing; it is a conversation starter. It bridges the gap between casual streetwear and dedicated cosplay, allowing you to represent your house pride and magical knowledge effortlessly.

I Solemnly Swear That I Am Up To No Good Shirt 2
I Solemnly Swear That I Am Up To No Good Shirt 2

Why The Shirt Went Viral?

This shirt exploded in popularity because it perfectly captures the “Main Character Energy” trend dominating social media. Users love the duality of the phrase—it suggests innocence mixed with a hint of rebellious chaos, which resonates deeply with a generation that values wit and nostalgia. The visual of the distressed text became a staple in “Dark Academia” and “WizardCore” aesthetic videos, turning a simple movie quote into a badge of honor for anyone who refuses to be boringly well-behaved.

Product Specifications:

  • Classic T‑Shirt (G500): 5.3 oz, 100% cotton for everyday comfort; Ash is 99% cotton and 1% polyester, Sport Grey 90% cotton and 10% polyester.
  • Ladies T‑Shirt: 100% preshrunk cotton; Ash Grey is 99% cotton and 1% polyester, with a feminine scoop neck and slightly tapered fit.
  • Crewneck Sweatshirt (G180): 8 oz fleece made from a soft 50% cotton and 50% polyester blend for warmth and durability.
  • Pullover Hoodie (G185): 5.3-ounce, 100% cotton (99/1 cotton/poly (Ash) & 90/10 cotton/poly (Sport Grey)
  • Long Sleeve T‑Shirt: 5.3 oz, 100% cotton; Ash is 99% cotton and 1% polyester, Sport Grey 90% cotton and 10% polyester for added softness.
  • Youth T‑Shirt: 5.3 oz, 100% preshrunk cotton; Ash is 99% cotton and 1% polyester, Sport Grey 90% cotton and 10% polyester for easy everyday wear.
  • Men’s Tank Top: 5.3 oz, 100% cotton with taped neck and shoulders and a tearaway label for extra comfort.
  • Women’s Tank Top: 4 oz fabric, 60% combed ring‑spun cotton and 40% polyester jersey, laundered to reduce shrinkage and designed with a flattering fit.
Sizes: Available in sizes S to 5XL to cater to various body types. Colors: Choose from a variety of colors depending on the selected style.

Kindly review your personalized details attentively, as numerous orders have arrived incomplete. Note that we exclusively dispatch to valid street addresses. Grishko collaborates with reputable shipping partners, including UPS, USPS, DHL, and Yun Express, Yanwen.

SHIPPING POLICY

WHAT ARE THE SHIPPING COSTS?

Within the U.S., shipping is priced at 5.99 USD. International shipping rates start from 13 USD.

WHERE DO WE SHIP?

We offer global delivery services.

Shipping time

US Regions:

Item Handling time (Mon-Fri) Shipping time ( Mon-Fri )
Apparel 1-3 days 3 -7 days
Mug 2-3 days 3-7 days
Poster, Canvas 1-3 days 3 -7 days
Hats 2-3 days 6-8 days
Bedding 3-5 days 7-10 days
3D Clothing, Hawaiian shirt… 3-5 days 8-12 days

Other Countries:

Handling time (Mon-Fri): 3-5 days

Shipping time ( Mon-Fri ): 15-25 days.

Note: Please be advised that shipping times may be influenced by public holidays, destination countries, and courier services. Delivered

Total delivery time= Handling time + Shipping time

Although we provide estimated shipping times, it’s prudent not to plan your delivery too close to your deadline as unforeseen delays, beyond our control, may occur. Please allow extra time to accommodate such circumstances. While we strive to ensure timely delivery, we cannot be held liable for delays caused by external factors like shipping carriers, weather, holidays, customs clearance, or inaccurate delivery information. If you encounter any issues with your order or need to make adjustments, feel free to reach out to us at [email protected]. Our team is dedicated to assisting you and resolving any concerns you may have. Regarding multiple shipping addresses, we regret to inform you that we do not currently support this feature. If you require items to be delivered to different addresses, we kindly ask you to place separate orders for each destination. For deliveries to PO Boxes or Military APO/FPO addresses, we do offer this service. Regarding VAT taxes, please note that international shipments from the US are sent DDU (Delivered Duty Unpaid), and we do not collect VAT at the time of purchase. The recipient is responsible for any applicable taxes, duties, or customs fees upon receiving the package. Local customs or VAT charges may apply, and we recommend contacting your customs office for further details on your country’s policies.

Why Choose the Grishko Collection

Defining modern comfort and timeless style—crafted for every occasion, tailored for every body

Pro-Grade Sewing & DTG Printing

Premium fabrics: Polyester, Spandex, or Cotton (product-specific). Engineered with reinforced stitching and advanced DTG technology for a durable

Natural Fit for Every Body

Sizes for every body: From XS to 5XL, tailored for your perfect fit.

Care Made Easy

For a lifetime of wear: Machine wash cold. Tumble dry low

Engineered Endurance

Crafted for endurance: High-density fabrics designed to maintain shape and color vibrancy, ensuring a fresh look that stands the test of time.

 
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4.9
Based on 9 reviews
5 star
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4 star
11
11%
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1-5 of 9 reviews
  1. EK
    Eileen K.
    Verified owner
    Grishko.comGrishko.com

    Very nice shirt..very quick shipping

  2. A
    Anonymous
    Verified owner
    Grishko.comGrishko.com
  3. LG
    Lynn Goodwill
    Verified owner
    Grishko.comGrishko.com
  4. A
    Anonymous
    Verified owner
    Grishko.comGrishko.com

    No problems

  5. EF
    Ellen Friese
    Verified owner
    Grishko.comGrishko.com