One last thing on the subject, Sisi!
There is no one magical wardrobe size because needs vary from person to person. Your lifestyle, climate, need for outfit variety, need for trendy updates, and your affection for fashion will greatly affect the size of your wardrobe. Other factors are the physical size and convenience of your closet.
I suggest to my clients that a wardrobe is the right size when they can successfully MANAGE it. They can remember their favourite items across the seasons, create sufficient outfit variety, and feel at peace when they enter their closet and dressing space. As soon as they’re overwhelmed, they need to cut back and/or edit. As soon as they’re bored, they need to think about how to refresh their style.