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.
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.
The Seakoff Dual-Layer Optical Illusion Tee takes a clean, everyday silhouette and elevates it with a stacked double-collar design that creates a convincing layered visual effect. From the front, it reads as two tees worn together — but it's one seamlessly constructed piece. The boxy, oversized fit and dropped shoulders give it a relaxed, modern shape that works across a wide range of body types and personal styles.
Comfort-Focused Construction
Made from a 60% cotton and 40% polyester blend, this tee strikes a balance between soft, breathable comfort and durable everyday wear. The fabric holds its shape well and resists the kind of stretching or warping that can affect lighter cotton-only tees over time. Whether you're wearing it solo or as part of a layered outfit, it sits comfortably against the skin without feeling heavy or stiff.
Versatile Styling for Everyday Wear
Available in white and dark charcoal, the Optical Illusion Tee pairs naturally with cargo pants, wide-leg trousers, or shorts for a streetwear-inspired look. The structured neckline detail adds visual interest without relying on graphics or logos, making it a strong foundation piece for any wardrobe rotation. Wear it tucked, untucked, or as a base layer under an open overshirt.
Frequently Asked Questions
Is this actually two separate shirts?
No. The layered appearance is a built-in design detail — it is a single garment constructed with a double-collar and stacked sleeve edges to create the optical illusion of two tees.
Does this run true to size?
This tee is designed with an intentionally oversized, boxy fit. Refer to the size guide measurements for length, bust, shoulder, and sleeve to find your best fit.
Size Chart
Size (in./cm)
Length
Bust
Shoulder
Sleeve
M
27 (70)
46 (117)
20 (52)
10 (26)
L
28 (72.5)
48 (122)
21 (54)
10 (27)
XL
29 (75)
50 (127)
22 (56)
10 (27)
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.
