The biggest reason people hesitate to buy vintage online is fit — and for good reason. Vintage sizing is wildly inconsistent. Here's how to get it right every time.
Why vintage sizing is different
Sizing standards have shifted dramatically over the decades (a phenomenon often called "vanity sizing"). A women's size 10 from the 1980s is closer to a modern size 4–6. A men's "Large" from the '90s is often cut far boxier and longer than a Large today. This is why you can't trust the tag — the number or letter means something different depending on the era.
The golden rule: measurements beat sizes
Always buy vintage by the garment's actual measurements, not its size label. Reputable sellers (us included) list key measurements for each piece. Those numbers are the truth; the tag is a suggestion.
How to measure (the easy way)
You don't need to measure your body — measure a garment you already own that fits the way you like. Lay it flat and measure:
- Chest/bust: armpit to armpit, then double it.
- Length: top of the shoulder (next to the collar) straight down to the hem.
- Sleeve: shoulder seam to cuff.
- Waist (bottoms): across the top of the waistband, then double it.
- Inseam (bottoms): crotch seam to the bottom of the leg.
Compare those numbers to the listed measurements on the item you want. If they're within an inch or two, it'll fit similarly.
Account for the fit you want
Like it oversized? Size the measurements up a few inches. Prefer fitted? Match closely. Vintage is great for intentionally roomy looks, so don't be afraid of bigger numbers if that's the vibe.
When in doubt, ask
If a measurement you need isn't listed, ask before you buy — a good seller will measure it for you. Since vintage and reworked pieces are one-of-a-kind, a quick question beats guessing on something you can't reorder.
Shop with confidence
Every piece at ThriftJam is described honestly, and we're happy to measure anything before you buy. Find the fit that's yours — and remember, with one-of-a-kind pieces, when it's gone, it's gone.