Translation:I miei pantaloni
this is NOT strictly true - young boys wear pants. Pants is used as a more fun word - also it can also be slang for 'rubbish' i.e. that's pants - so you will probably hear it. Pants are definitely trousers and this distinguishes them from underpants. However, it may be safer to use the word trousers or jeans
No!!! In ENGLISH- the language spoken in ENGLAND - 'pants' are what you wear under your trousers. If colonial dialects choose to give it other meanings, that is up to them!
Added - Cummon guys, lighten up.... it was a lighthearted comment emphasising the fact that British English and other varients differ in how they use words.... and a comment on the fact that native English speakers have complained about DuoLingo insisting on American English spellings and grammar (though it is getting better at that!)
Am i alone in thinking that your reply is so rude? I have said above that it is preferable to use trousers or jeans but the word pants IS used. Perhaps regionally or in a more informal way. We also commonly use terms like jogging pants and ski pants and in context English people would know perfectly well what you were talking about. I know many people who would use the word pants but I know no one who would refer to 'colonial dialects' !!! As a person born and bred in England (with ancestors going back to before the Conquest) your response is not only rude but arrogant - if I had been American, or Canadian for example, I would be aghast. I will not reply to any further comment that you make as I find your attitude demeans English people and those who come to this programme to learn - rather than hear someone 'mansplaining' OK be wary of how you use the word but please don't assume that all English people are so crass (pants maybe!)
In Italian, you tend to say "pantaloni" always. "Pantalone" is very colloquial, I wouldn't use it.
If you want to say that they are singular you say "Un paio di pantaloni" (It doesn't make so much sense, I know, but that's how we count trousers... Un paio di pantaloni, due paia di pantaloni, tre paia di pantaloni...)
The answer is in your question - it is a PAIR of trousers. In English we don't say 'I put on my trouser'. As in English, pantaloni is a plural word for a single object - I think it goes back to medieval times when the two trouser legs were seperate pieces of cloth that were tied together when you put them on.
You're right, the Italians use the plural form too, like the English. I can't get used to it, saying plural for a single piece of garment. Those trouser legs have been sewn together for centuries! It is just one item of clothing. I thought I had learned the singular form with the tiny cards ;-(