Leather Jackets 101

When do people normally wear a leather jacket? I'm guessing temperatures ranging from 35-55 degrees? Under 30-35 degrees is too cold to wear them?

Are these supposed to be worn in more casual environments, with jeans and boots?

I just bought the RRL A2 jacket and want to know when I should wear it.

What do people wear under it? Just a shirt I'm guessing? No sweaters unless really cold, and if so a crew neck?

Thanks a lot for your imput!

bump

I guess this is a stupid question given the lack of feedback I've received. Apologies.