There is no problem wearing a sweater in the red one. You should show your neck, not a high collar, but try to show your neck. This is a waist style. Just pull out the waistline. Don't wear jeans below, put on velvet leggings, it won't be too cold, if not, just a thin pair of autumn trousers inside and a velvet black leggings outside. Shoes depend on your leg shape, otherwise your legs will be thick and short.

This white coat, wearing blue denim tights is no problem. The key is to choose shoes.