Sim won't change clothes

[ash2708]

I now have a 6 Sim household, and one of them refuses to change her clothes. She showers, sleeps, swims, you name it in her everyday clothes. I married her into my family and initially restyled her clothes using one of the stylized outfits. I thought that was the problem so I changed her clothes again to separate pieces and nothing works. I've reset her at least 5 times with no change. None of my other sims do this so I'm not sure if it's because I married her in or what. Please help!