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Estimated Shipping Times Estimated delivery times vary by destination:
USA & Canada: 7–12 business days
Germany & UK: 3–9 business days
Europe: 5–12 business days
Asia Pacific: 10–20 business days
Australia: 8–15 business days
Typical delivery times are 3–12 business days, depending on the destination. Please note that actual delivery times may vary due to customs, carrier delays, or peak shipping periods.
Shipping Protection Shop with confidence — every order is covered by shipping protection from dispatch to delivery. In the event of loss or theft, we offer a full refund or complimentary reshipment.
Shop with confidence — we offer a 30-day money-back guarantee and accept returns within 30 days after delivery for eligible items that are unused, in their original packaging, with tags attached. If your item arrives damaged, defective, or incorrect, please contact us and we’ll work with you to make it right.
For quality-related issues or shipping mistakes on our side, we’ll cover the return shipping cost. Approved refunds are issued to your original payment method within 1–3 business days after inspection.
This oversized long-sleeve tee from MT99 delivers a bold streetwear statement through a clever faux two-piece construction. The black cotton body is paired with attached grey-and-black striped sleeves that mimic a layered look, while a distressed Union Jack graphic dominates the back alongside the slogan "Growing in the World, Make True, Have MT99." A detailed heraldic crest embroidery sits on the left chest, completing the British-inspired aesthetic.
Product Highlights
Faux two-piece design: solid black body with attached striped long sleeves for an effortless layered look
Large distressed Union Jack print across the full back panel
Embroidered heraldic crest with Union Jack shield on the left chest
Mixed typography back graphic in white and red script lettering
Relaxed oversized silhouette with a crew neckline
Hip-hop and streetwear styling with a vintage worn-in finish
Fit & Styling
Cut in a relaxed, oversized fit that sits comfortably on the shoulders and through the body. The dropped shoulder seam and wide chest make it ideal for pairing with slim or straight-leg trousers, cargo pants, or jeans. The faux-layered sleeves add visual depth without the bulk of actual double layers. Best worn as a standalone statement piece; size up if you prefer an even more oversized drape.
Product Details
Constructed from approximately 100% cotton jersey for the main body, with the striped sleeve panels in a cotton-polyester blend. The fabric has a mid-weight feel suited to transitional seasons. Crew neckline. Long sleeves with attached striped cuffs. Distressed screen print on back. Embroidered crest on front left chest. Brand label at inner neck. Available in Black.
Size Guide
Use the measurements below as a guide and compare them with a similar item you own.
Size
Length (cm)
Chest (cm)
Shoulder (cm)
Sleeve (cm)
M
68
124
57
51
L
69
128
59
52
XL
70
132
61
53
How to Find Your Perfect Size — Every Time
How to Find Your Perfect Size — Every Time
Struggling to pick a size online? Here's a simple trick: instead of guessing, use a piece of clothing you already own — and love the fit of — as your reference point.
Step 1: Pick Your Reference Item Think of a T-shirt you've bought before that fit you perfectly. Find that order and pull up its size chart.
Step 2: Focus on Two Key Measurements For streetwear-style tees, two numbers matter most:
Chest width— too narrow and it'll feel tight
Length— too long and it'll look sloppy
💡 Tip:Size charts sometimes list "Chest" as theflat-lay widthinstead of the full circumference. Here's how to tell the difference:
Large number(e.g., 49in / 124cm+) → likely the actual chest circumference
Small number(e.g., 24in / 62cm) → likely the flat width (garment laid flat and measured edge to edge)
Step 3: Note Your Ideal Numbers Write down the chest and length measurements from your best-fitting shirt. Care about sleeve length or shoulder width too? Note those down as well.
Step 4: Match to Our Size Chart Now check Seakoff's size chart and pick the size whose measurements are closest to your notes. That's it — no more guessing.
Works for Everything This same method applies to hoodies, sweaters, jackets, and more. Do it once, and you'll be able to shop confidently, anywhere — every time.
