Formal:
* T 恤 (T xù): This is the most common and formal way to say "T-shirt" in Mandarin. It literally translates to "T cloth."
Informal:
* T 衫 (T shān): This is a more informal way to say "T-shirt" and is often used by younger people.
* 短袖 (duǎn xiù): This means "short sleeve" and is a more descriptive way to refer to a T-shirt.
Other options:
* 汗衫 (hàn shān): This literally translates to "sweat shirt" and can be used for T-shirts that are made of sweat-wicking material.
The best way to choose which term to use is to consider the context of the conversation. If you are talking to someone formally, it's best to use "T 恤 (T xù)." If you are talking to someone informally, you can use "T 衫 (T shān)" or "短袖 (duǎn xiù)."