Our house is old and when we moved in, had one closet (reach-in) which was in the laundry room. This is used for DH’s work clothes, and our coats off-season. Current coats just have to hang on hooks on the basement door in the kitchen. In our bedrooms, we had rolling racks or a Rubbermaid shelf with hanging space.
When the girls were younger teens, we added on a main floor bedroom for us and the closet is maybe 6’x6’. Then, we turned the center bedroom upstairs into two large closets for the girls. This addition/remodel was the best thing ever for this house!