See what you already have
Separate clothes into everyday items, things for another season and items that no longer fit. The same size label can fit differently across brands. Organise around the clothes you actually use rather than relying only on age labels. Keep frequent favourites easy to reach.
Make a gap list before shopping
Consider your laundry routine and storage space. List items that are actually missing rather than buying only because something is on sale. Check the condition of unused items and ask the receiving organisation about donation and reuse requirements.
Your next little step
Choose one idea that suits your family and try it at your own pace. Every family has different needs.