pants
The word 'pantaloni' in Italian is used to refer to trousers or pants. It's used in the same way as in English. For instance, 'I pantaloni sono blu' means 'The pants are blue'.
My pants are blue.
This is a simple sentence declaring the color of one's pants. It uses the possessive 'miei' (my) indicating that the pants belong to the speaker, and 'blu' that is the color blue in Italian.
You left your pants at my house.
This sentence is informing someone that they left their pants behind. 'Hai dimenticato' means 'you have forgotten', 'i tuoi pantaloni' means 'your pants' and 'a casa mia' means 'at my house'.
Where can I buy new pants?
This sentence is a common way of asking for a location where the speaker can purchase something, in this case, new pants. 'Dove' means 'where', 'posso comprare' means 'can I buy', and 'pantaloni nuovi' means 'new pants'.