1. It's called a business suit, especially if it has a jacket and skirt, but jacket and pants, too. Sometimes the suit with pants/trousers is also called a pantsuit.
2. My granddaughters refer to those socks as liners. The ones that can be seen are either anklets or knee-highs, depending on how high up the leg they go.
3. Yes, "at" is not needed.
4. For clarity, I'd spell them "skater-shoes" -- or "Nike sneakers" (no hyphen needed).
5. It's fine, yes.
I included my doubts in short sentences. Thank you.
1) What/how do you call a woman's suit made up of a jacket and a pair of trousers? I don't really know.
2) How do you call very short socks, which are completely hidden by the shoes and are usually worn in the summer? I don't really know.
3) What time are you going to the cinema (at? is a mistake if you put it at the end of the question?)
4)The Skaters usually wear large zip-up hoodies, baggy jeans and big skater (??) shoes or Nike sneakers.
5) He is known to be the man who cut the rope. (Is the passive OK?)
2 answers
Different heights of socks!!
http://www.littlemissmatched.com/Catalog/girls-socks
http://www.littlemissmatched.com/Catalog/girls-socks