Size Guide
DIA pieces are designed with one oversized fit. Here's everything you need to know before you order.
Why One Size?
Every DIA piece is made in a single, generous oversized fit — designed to work for most body types without forcing you to guess between S, M, and L. It's not about picking your size; it's about getting the relaxed, drop-shoulder silhouette DIA is built around. If you usually wear a fitted look, this will feel bigger. That's the point.
How It Fits
Our oversized fit is intentionally relaxed through the body and sleeve, with dropped shoulders for an easy, lived-in shape. If you prefer a closer fit, consider sizing reference to your usual fitted tee or hoodie length and compare to the measurements below.
T-Shirt — One Size / OS
How It Fits
How to Measure:
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Length — Measure from where the shoulder seam meets the collar down to the hem.
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Shoulder — Measure from one shoulder seam to the other.
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Chest — Measure from one side to the other, just below the armpits.
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Sleeve Length — Measure from the shoulder seam to the cuff (hoodie/sweatshirt) or sleeve opening (T-shirt).
Sizing Reassurance / mini-FAQ block:
Will this run big?
Yes — that's the design. DIA pieces are made oversized on purpose.
I'm tall — will it still work?
The relaxed cut is designed to flatter a wide range of heights and builds. Check the chest and length measurements above against a piece you already own and love the fit of.
Still unsure?
Email us at hello@diadayinamerica.com — we're happy to help you compare against something in your closet.