I try to not go into stores at all when I want to make sure I don't spend money/bring more crap into the house. I add stuff we need to shopping lists and put off going to the store for as long as possible. Sometimes I learn that I can live without whatever it was I thought I wanted...
But replacing your wardrobe when you lost weight, that's just something that costs money. Do you already have a budget for what you will spend on the wardrobe refresh?