It is so easy to continue buying things and not donate at the same time but my philosophy on buying new clothes is, the most expensive thing in your wardrobe is the items you aren’t wearing (regardless of how much it cost you).
Simplify your wardrobe by only buying things you LOVE that make you feel amazing. If it doesn’t make you feel your best, get rid of it. Donate the items and you’ll feel even better. If they are designer brand, you can also sell the items. Only add things in your wardrobe that add to your brand, your look, your message. Take everything out of your wardrobe and then only put back the things you love. You will totally see what you need once you do that!