I'm no longer on SL but making yourself will be relatively easy. A lot of the Avatar makers that do furs have a fox among their species. Luskwood is good, as is Lost Creatures. Despite the fact that my persona is a wolf I loved using Mutation Industries's fox avatar. But I like it a little spooky. Ninja Weasel would be good to look into as well as they had free color textures for hair. Clothing wise, there is one place you're going to want to spend a lot of time at and that's Bare Rose. If you're into anime this can be one stop shopping for all your clothing and accessory needs. I could be prejudiced because when I was still there I used to model for them as a furry.