I am against custom content, not because it's made by other players, but because it can be dangerous to download it... It can give you some nasty surprises. I think EA should release a 'furniture/clothing modification tool' so players can make their own stuff in a safe way.
I partly agree with Master Siwel, but it could be so much easier to add stuff to your game with a special tool. We already have "Create a pattern", so let's see what the future will bring us...