Streetwear Sizing and Fit: Turn a Size Chart Into a Tee or Shorts That Actually Fits

Two size charts can both say "M" and mean completely different things. Nike's men's tops charts state outright that the numbers are body measurements — a 96–104 cm chest range describes the person, not the shirt. A streetwear listing that prints "chest 21 in" is usually describing the garment measured flat, and you have to double it to get a circumference. That single mismatch accounts for most of the fit complaints we log at our Portland bench, and it is fixable in about four minutes with a tape measure.

Identify which kind of chart you are reading

• Ranges of numbers per size ("chest 37.5–41 in") are body measurements. Compare them to your own body, at the fullest part of the chest, tape level.
• One number per size ("chest width 21 in", "body length 28 in") is a garment measurement, almost always taken flat on one layer. Compare it to a garment you already own.
• A number plus a fit word ("loose", "relaxed", "boxy") means the ease is built into the cut. Do not add more by sizing up unless you want the silhouette itself to change.

Measure the tee you already own, not just yourself

Body measurements tell you your size. Garment measurements tell you whether you will like the result. The second set is where streetwear shopping is won. Lay your best-fitting tee flat, smooth it without stretching, and take four numbers:

If three of the four chart numbers land within half an inch of your reference tee and one is off, you have to decide which one you will live with. Protect the shoulder seam: a one-inch shoulder error is visible across a room, while half an inch of hem length disappears in a tuck or a wash. That is also why drop-shoulder cuts exist — moving the seam outward buys volume without touching the chest grade at all.

Do the ease math before you pick a size

Ease is garment chest circumference minus your body chest. For cotton jersey tees, we treat 0–1 in as close, 2–3 in as a standard fit, 4–6 in as relaxed streetwear, and 7 in or more as genuinely oversized. A loose-fit crew listed at 21.5 in flat works out to 43 in of circumference. On a 40 in body chest that is 3 in of ease — a clean relaxed fit, not a tent. Moving up one size typically adds an inch of flat width, so the same tee in L gives you 4 in of ease, a lower shoulder seam and a sleeve opening that hangs past the bicep.

Grading tells you whether sizing up can fix your problem

Alpha grading in streetwear tees usually runs about 1 in of flat chest width per size, 0.5–0.75 in of body length and 0.5 in of shoulder. Width grows faster than length, which makes sizing up a bad trade when your complaint is torso length: you get a wider shirt with a hem that still sits above your waistband. Buy length from a tall cut or accept the shorter silhouette. Shorts grade differently again — roughly 2 in of waist per size and half an inch of inseam — so inseam is not a sizing lever at all.

Shorts: waist is the easy number, rise and inseam are the real ones

Most shorts charts publish a waist and stop. Measure a pair you own at the relaxed waistband, then at full stretch, then the front rise, inseam and leg opening. Elasticated waistbands in cotton fleece and nylon typically stretch 3–4 in past the relaxed figure, so the listed waist is a floor, not the fit. Between sizes on a 7 in inseam short, take the smaller waist: a larger waist with the same inseam sits lower and reads longer than the number suggests. At a 9 in inseam, size up instead — the extra rise is what keeps the hem off your knee.

Budget length for shrinkage, especially in cotton

Knitted cotton relaxes with washing, and almost all of that movement is lengthwise. Published laundering trials on 100% cotton single jersey tees recorded roughly 10–13% shrinkage at the shoulder and full body length after 20 home washes, with about an 11% reduction in overall length — enough to peel a hem off the hips. Well-compacted jersey moves 2–3% across its first three washes; loosely knit, unfinished fabric can move 5–8%. Practical rule: if you tumble dry, buy a tee whose HPS-to-hem number is at least 1 in longer than your target. If you line dry compacted cotton, buy your measured number.

Nike's own fit guidance is blunt about the borderline case: "If you're on the borderline between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit."

Reading a real listing

The loose-fit cotton crew in the product catalog — Polo Ralph Lauren's logo tee, listed at the $20.90 we paid across a wide color range — is a useful case study precisely because the brand name carries no fit promise. Its block grades like a relaxed tee, so the size whose flat chest is 2–3 in above your body chest is the one that reproduces the look in the photos, not the size you wear in a slim-fit tee. Treat each colorway as its own line item, too. Verify the option list and the product-specific photographs rather than assuming one measurement covers every variant, because finish, materials and package contents can differ between variants.