Worldwide Shipping Available Orders are processed within 1–3 business days and shipping costs are calculated at checkout. Tracking information will be sent once your order has been dispatched.
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.
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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.
A bold Japanese streetwear-inspired flannel shirt featuring a large embroidered "Perfectly 31" varsity patch across the chest, complete with star appliqués and metallic stud detailing. Available in three classic plaid colorways — black/grey, tan/brown, and red/brown — this oversized long-sleeve button-up brings retro athletic energy to casual everyday dressing.
Product Highlights
Classic tartan plaid woven fabric in three distinct colorways: black/grey, tan/brown, and red/brown
Large embroidered "Perfectly 31" varsity-style chest patch with star motifs and metallic stud trim
Relaxed oversized silhouette with a standard point collar and full button placket
Long sleeves with buttoned cuffs for a clean, polished finish
Lightweight flannel construction suitable for spring and autumn layering
Japanese streetwear aesthetic blending preppy plaid with bold graphic embellishment
Fit & Styling
This shirt is cut in a relaxed, boxy fit that sits comfortably on the shoulders and through the body — ideal for wearing open over a graphic tee or buttoned up as a standalone top. The oversized proportions make it versatile for layering. Pair it with slim jeans or cargo pants and chunky sneakers to lean into the streetwear vibe, or wear it tucked into wide-leg trousers for a more styled look. The bold chest patch makes it a statement piece, so keep the rest of the outfit simple. Sizing runs generously; refer to the size chart for chest and shoulder measurements before ordering.
Product Details
The shirt is constructed from a soft flannel-weight fabric, estimated at 100% Cotton, giving it a comfortable hand feel and breathable wear across mild seasons. The embroidered patch is stitched directly onto the front chest panel and features layered appliqué work with metallic stud accents. White plastic buttons run down the full front placket and at the cuffs. Available in sizes M, L, and XL.
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
72
120
54
56
L
74
124
56
57
XL
76
128
58
58
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.
