Same thing, eight ways to say it

How to say “a T-shirt” in Spanish — country by country

The dictionary word is camiseta — RAE/ASALE; understood everywhere — but it is the everyday word only in ES, CO and (alongside playera) MX. In AR, CL and PE camiseta drifts to «undershirt» or «football jersey», so each of those has its own local-standard word (remera / polera / polo). DO and PR lean on English (poloché, t-shirt) plus franela. Here is what you'll actually hear in eight cities, with the source for every cell.

What people actually say

WhereThey sayAlso · notes
Argentina Buenos AiresremeraAlso: chomba (= polo shirt); camiseta = undershirt or football jersey
Chile SantiagopoleraAlso: polerón (thick / sweatshirt); camiseta = undershirt or football jersey
Colombia MedellíncamisetaAlso: camisilla (undershirt)
Medellín vs Bogotá not differentiated in any source.
Dominican Republic Santo DomingofranelaAlso: poloché (polo shirt; DAMER RD); t-shirt / camiseta
DAMER RD gives both the undershirt and the T-shirt sense; the only Dominican poster found uses franela for the undershirt.
Spain MadridcamisetaAlso: camiseta de tirantes (tank top); polo = polo shirt
Mexico Mexico CityplayeraAlso: camiseta (esp. plain/white or as undershirt: camiseta interior)
Peru LimapoloAlso: polo camisero (polo shirt); polera = long-sleeve/hoodie; camiseta = sports jersey
Puerto Rico San Juant-shirtAlso: camiseta; camisilla = undershirt
Anglicism; Tesoro PR headword is t shirt with variant t-shirt, feminine — an anglicismo crudo marked usual.

Grey = the pan-Hispanic dictionary word is what people really say there. Blank = we couldn't source it yet.

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Sources

Every cell above is backed by human-authored lexicography or a native speaker who says where they're from — ASALE's Diccionario de americanismos, El Colegio de México's Diccionario del español de México, the Tesoro lexicográfico del español de Puerto Rico, the Peruvian Academy's DiPerú, and country-stated posts on language forums. Nothing here comes from a model's recall. Spot a mistake? Tell us — corrections from native speakers go straight in.

Argentina — remera
DAMER: remera. f. Ar, Ur; Bo, Py, pop + cult → espon. Camiseta de manga corta.
WordReference · pelus (Argentina): Remera (con mangas, sin cuello agregado)… Camiseta, prenda interior
Chile — polera
DAMER: polera. 3. Bo, Ch. Camiseta deportiva de manga corta.
WordReference · Vampiro (Chile): Las que van por fuera, sean como sean: polera, y si es gruesa, polerón
Colombia — camiseta
WordReference · Cal inhibes (Colombia): Camiseta: Con mangas cortas, con o sin cuello
WordReference · oa2169 (Colombia): En Colombia… para hombre: camiseta o camisilla
Dominican Republic — franela
DAMER: f. Pa, RD, Co, Ve. Prenda interior de algodón… que cubre el torso. 2. RD. Camiseta, prenda deportiva.
DAMER:
WordReference · Minnie121728 (República Dominicana): Aqui en Republica Dominicana, le llamamos 'Poloshirts', a esas que llevan manga y 'Franela', a las que se usan debajo de una camisa
Spain — camiseta
WordReference · Lumia (Spain): En España, camiseta y si es de tirantes, camiseta de tirantes
WordReference · Colchonero (Spain): En España se usa camiseta
Mexico — playera
DAMER: playera. 1. f. Mx, Ni. Camiseta de algodón, de manga corta y sin cuello.
DEM (COLMEX): playera s f Camiseta de algodón, generalmente de manga corta: playera de rayas
WordReference · lineaadicional (Mexico): Playera: las que son estampadas y tienen mangas
Peru — polo
DiPerú: polo. m. Text. Prenda, generalmente de manga corta, que cubre desde el cuello hasta la cintura o cadera.
WordReference · ERASMO_GALENO (Perú): En Perú, polo (que es de manga corta…). Camiseta sólo se usa aquí para los polos de material sintético… deporte
Puerto Rico — t-shirt
Tesoro PR: t shirt… Camiseta. Camisa informal de punto con manga corta y sin cuello… Anglicismo crudo, usual. (ex. «tiene puesta una t shirt promocional color blanca»)
DAMER: RD, PR, Ar, Ur. Prenda interior masculina sin mangas
Where we're less sure
  • DO — needs a native check. DAMER RD sense 2 («Camiseta, prenda deportiva») supports franela = T-shirt, but the only Dominican poster found (Minnie121728) uses franela for the undershirt and «Poloshirts» for sleeved tops; Dominicans may in practice say t-shirt or poloché for a plain tee. No entry from the Diccionario del español dominicano could be fetched (not online).
  • CO — Medellín vs Bogotá not differentiated in any source; both Colombian posters just say «En Colombia… camiseta». Camibuso is NOT in DAMER; do not use.
  • PR — the T-shirt cell rests on the Tesoro entry alone (plus DAMER camisilla for the «also»); no WordReference Puerto Rican poster explicitly discussing the garment was found. Tesoro headword is «t shirt» with variant «t-shirt», gender f. (sust.), sources cited there: Morales de Walters 2001 + El Nuevo Día examples.
  • PE is solid (DiPerú + two Peruvian posters), as are AR, CL, ES, MX.
  • Cells marked «standard (grey)»: CO, ES.
  • Source caveat: dle.rae.es returned 403 to every fetch, so the DLE wording quoted in the playera trap (tenis = «zapatillas de deporte»; synonyms bambas/deportivas/playeras; bamba «De Wamba®») comes from search-engine snippets of dle.rae.es/tenis and dle.rae.es/bamba, not from the fetched page — re-check before quoting on a card.