1. The one in, one out rule was a game changer for me. What would the purchase be replacing? It also warded off gifts from Mom or hand-me-downs from my sister.
2. The 20%/80% rule helped me further cull my closet (you only wear 20% of your clothes 80% of the time).
3. Making a decision to shop more ethically promoted conscious shopping. No more H&M, Zara, Forever 21 etc. Look for longer-lasting, preferably ethically-source items, even if they're more expensive.
4. Repair. Do you have pieces you love? Spend the money to get them re-soled, hemmed, let out, etc. rather than buying a replacement.
I second everyone else's suggestions about deleting apps and websites. If you need it once you see it, you don't need it. For instance, for two years I'd been consciously looking for a LBD - A-line, crew neck, wash at home, dress up or dress down, weekend and work attire. After two years, I gave up intently looking. So when I finally stumbled onto the dress in BR, I bought it without hesitation, recognizing this was an item I wanted not because I saw it, but because I recognized a hole in my wardrobe and wasn't willing to sacrifice for something "just OK." Email ads, browsing in stores, etc. are terrible about this, because when we see a good deal, we have to jump on it (but will it be part of your 20%/80%?)
Finally, deals. Because 80-90% off is awesome! But the best deal is not spending anything. 100% discount!
Find something else you love (for me, it's cookies). Until you break the habit, reward yourself with a cookie (insert your non-clothing weakness here) until you break the habit. Then, reward yourself with a cookie for every item you sell/donate without replacing, until you achieve a wardrobe that reflects your desires and your lifestyle. It doesn't HAVE to be Project 333 level, but if you want to shoot for that go for it!
Breaking habits is hard, but it can be done. Good luck!
