Shirt Nerds 101 — the RSVLTS collector's glossary

Buying and trading

Is it authentic?: The awkward question, so here it is plainly. RSVLTS sell through their own site, their app, and shops they actually partner with. Anywhere else, they say themselves, you might not be getting the real thing. We bring it up because this app pushes you toward buying from other collectors — For Trade and For Sale are the whole point — and it would be a bit rich to encourage that and then go quiet about the risk. The official Buy-Sell-Trade group is a real place to buy from other collectors, and RSVLTS's own advice there is the same as ours: read the group rules, and go at your own risk. Genuinely unsure about something you have been offered? Their store team reads store@rsvlts.com.

Acronyms

KUNUFLEX: The stretchy button-down fabric that made RSVLTS what they are, and the name of the shirts cut from it. You will see it everywhere: KUNUFLEX Short Sleeve, KUNUFLEX Long Sleeve. Worth knowing it is a FABRIC and not a fit — the same design can turn up as a KUNUFLEX shirt, a polo and a hoodie, and plenty of us own more than one of those on purpose.
BST: Buy / Sell / Trade. If someone says "check the BST", they mean a group where collectors deal with each other directly. We never touch the money side here — flagging a shirt For Trade or For Sale on Shirt Nerds just puts your hand up. The handshake happens somewhere else.

Condition

NWT / NWOT: New With Tags, New Without Tags. Both mean never worn. NWOT usually means it sat in someone's closet long enough that the tags came off, which is most of us.
NIB / NIP: New In Box, New In Package. For the things that never came on a hanger — pins, hats, plush, anything that arrived sealed. If you kept the packaging, say so; the people chasing pins care.
EUC / VGUC / GUC: Excellent, Very Good, and Good Used Condition. The ladder for a shirt that has actually been worn. EUC could pass for new, GUC has clearly been to a few places and is none the worse for it. Most collections are mostly GUC and that is fine.
Fair / Flawed: Worn, and something is genuinely wrong — a stain, a snag, a button gone missing. Say it out loud. Every collector would rather read "small mark on the left cuff" than find it themselves, and the ones who say it are the ones people trade with twice.

How releases work

Drop: A release. RSVLTS put shirts out in batches rather than a steady trickle, and a drop is one of those batches — which is why so much of this catalog is grouped as "April 2026" and the like. Drops land in the afternoon and the good ones do not hang around.
DropZone: The white-whale corner of the RSVLTS app. Small runs of rare stock — old designs brought back, limited one-offs — in tiny quantities and not many sizes, and only in the app. Never on the website. Things that pass through here are often harder to find later than the drop they originally came from, which is exactly why people set alarms for it. RSVLTS opened it in April 2021 running Fridays at noon Eastern with a push alert; check the app for how it runs these days.
Field Notes: RSVLTS's blog. Worth knowing the name, because people will say "it was in the Field Notes" and assume you know — and it is genuinely where drops, collabs and convention line-ups show up first, usually before anything else does.
Convention exclusive: A shirt sold at a show and nowhere else. No website listing, no restock, gone when the booth packs up. These are the hardest shirts in the hobby to pin down, and for a lot of them the only proof they ever existed is a collector who was standing there with cash. That is why this app lets you tell us which convention a shirt came from — half of what we know, we know because somebody was in the room.
Colorway: The same artwork printed in a different set of colours. We keep colourways as separate shirts rather than one shirt with options, because that is how collectors actually think about them — owning the blue one does not mean you have stopped looking for the red one.

Sizing

KUNUFLEX short sleeve — adult measurements: RSVLTS publish these in centimetres on their international size guide. Body length, chest, then sleeve length. Divide by 2.54 for inches.

XS — 68.5 / 47 / 21.5
S — 71 / 49.5 / 23
M — 73.5 / 53.5 / 23.5
L — 78.5 / 57 / 24
XL — 81.5 / 61 / 25.5
2XL — 82.5 / 66 / 26
3XL — 84 / 73.5 / 28
4XL — 86.5 / 82.5 / 30.5
5XL — 91 / 91.5 / 34.5
KUNUFLEX short sleeve — women's measurements: Centimetres, from RSVLTS's international size guide. Body length, bust, sweep, then sleeve length. Sweep is the width at the hem.

XS — 66 / 43 / 48.5 / 17
S — 68.5 / 47 / 51 / 18
M — 68.5 / 49.5 / 53.5 / 19
L — 73.5 / 56 / 58.5 / 19.5
XL — 75 / 59.5 / 63.5 / 21
2XL — 75 / 63.5 / 66 / 22
3XL — 76 / 68.5 / 71 / 23
4XL — 76 / 71 / 75 / 24
KUNUFLEX short sleeve — youth measurements: Inches, as RSVLTS publish them. Length, width, then sleeve length. Width is the flat measurement from arm edge to arm edge — double it for the full chest. Sleeve length is measured from the shoulder seam.

XS — 20" / 16 1/8" / 6 3/4"
S — 21 1/8" / 17" / 7"
M — 22 3/4" / 17 3/4" / 7 1/4"
L — 24 1/4" / 18 1/2" / 7 1/2"
XL — 25 1/2" / 19 1/4" / 7 3/4"
2XL — 27 1/4" / 20" / 8"
Boxer briefs — waist and hip: Inches. Measure the circumference around your body with a tape measure, not too tight. Waist is the smallest part, at or just above the belly button. Hip is the fullest part of the lower hip, heels together.

SM — waist 28–29, hip 35–36
MD — waist 30–31, hip 36–37
LG — waist 32–33, hip 37–38
XL — waist 34–35, hip 39–40
2X — waist 36–37, hip 41–42
3X — waist 38–39, hip 43–44
4X — waist 40–41, hip 45–46
Shorts: 7-inch and 5.5-inch inseams: RSVLTS make shorts in two inseams and the difference is obvious on the leg: the 7-inch sits around mid-thigh, the 5.5-inch noticeably higher. The inseam is measured from the crotch seam to the hem. Listings usually name it, and it is a real difference rather than a rounding — worth checking before you buy a pair second-hand.
Classic and Vintage crewneck tees fit differently: They are two different cuts, not two colourways of one shirt. On the same person at the same size, the Classic is the closer, standard tee fit; the Vintage is boxier and shorter in the body, the way a washed vintage tee sits. If you wear a Medium in one you may not want a Medium in the other, which matters when you are buying from another collector and cannot try it on.
Iron-on patches: how RSVLTS say to apply them: Lay the jacket flat, ideally on an ironing board, and arrange the patches where you want them. Heat the iron fully on the cotton setting — about 400°F / 204°C. Put a soft blank fabric (a t-shirt, pillowcase or towel) over both the jacket and the patch, then press down through it, holding 15–20 seconds and spraying the iron's steam two or three times. Let the patch and the denim cool completely before moving it, about two minutes. Check every edge has taken; repeat on any that has not. For patches you never want to lift, add a few stitches by hand.