This is a snazzy feature that has been added in the last year (which I have newblie discovered >.>). Its definitely about time that had this feature, since the orginal designs are kinda plain, and not really that nice in my opinion. I will attept to make some outfits later, but for now I'm just going to write up some of my critique of outfits I have seen so far.
The best avatar outfit combo I have seen so far is by Daisy (currently 19th in the hall of fame). The empire cut dress is a really good idea to naturally add some shape and style to the upper body that is shown.
I don't think any of the default eyes are nice though...might consider making anime eyes and seeing if those work better. Will post more later..still trying to work out what works.