If it is all plaid, it will cause others' visual fatigue and confusion. Can be matched with bright colors.
2, leggings+sweater+scarf?
Underwear is best or jeans and pencil pants are also ok. Because the coat is loose, pants should be simple and relatively elegant, and the colors of pants and scarves should be brighter. Otherwise, it is easy to look old. Or the traditional colors of gray and black. But try to use solid colors. You can choose a red scarf Or beige is fine. It is best to match according to your own personality and hobbies.