It means, "Where do you [personally] buy a T-shirt?"
Donde compras la ropa means "Where do you shop for clothes"? (Donde-where compras-you shop la ropa-clothes)
Where is my undershirt, senorita
'Donde Estudias?' means 'Where do you study?'
I think you mean Donde which is Where (in english)
hola donde estas
¿dónde estás? means where are you?
'Donde estas ahora' = Where are you now
Donde = when The other words are not (or don't look) Spanish
"Where does it stay?"
It means "where do you pay?"
where are you from
Where were you (familiar) born?