How to Say "undershirt" in Spanish
The Spanish word for “undershirt” is “camiseta” — A1 level. This is a very common word in everyday Spanish.

Examples
Me puse una camiseta azul para ir al parque.
I put on a blue T-shirt to go to the park.
Llevaba la camiseta de su equipo de fútbol favorita.
He was wearing his favorite soccer team's jersey.
Necesito doblar las camisetas limpias y guardarlas en el armario.
I need to fold the clean T-shirts and put them away in the closet.
Gender Alert
Remember that 'camiseta' is a feminine word, so you must use 'la' or 'una' before it, and any describing words (adjectives) must also end in '-a' (e.g., la camiseta roja).
Confusing T-shirt vs. Dress Shirt
Mistake: “Using 'camiseta' when you mean 'camisa' (a button-up dress shirt).”
Correction: 'Camiseta' is always the casual T-shirt. Use 'camisa' for the more formal, collared shirt.
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