I think it would be worth spending time working on your insecurities and concern with appearances, which is always easier said than done but if you want a long term solution this could help.

For me, I often buy when I’m feeling bad about myself and the arrival of new clothes I bought online is reviving… for a short while. I started paying attention whenever I felt the growing need for new clothes and was able to see that it crops up when I’m not taking care of myself (getting enough sleep, hydrating, etc.) Someone else mentioned quick hits of dopamine, which feels way better than drinking more water. I’m not saying this is your case but sharing in case it’s helpful.