If you can't buy clothes, you have a mod already in your game that broke it. You certainly don't need another mod to fix the broken mod, but you do need to find the mod that broke your game. Use the Hack Conflict Detection Utility from
www.simwardrobe.com to help you find it. Sims2Pack Clean Installer and Delphy's Download Organizer (both from
www.modthesims.com) can help also. It will also help to ensure you have the current versions of all of your mods, and if you can't find if it's the most current consider removing them.