I'm not really sure if a body suit is possible, but I could be wrong. In the meantime, there is a preset texture that is extra fluffy here. (http://www.deviantart.com/art/Kittenfluff-Texture-580700547) One of my friends uses it, and it's quite good. Hope this helps in some way. ^^
[size=9] Like said before, it would be quite difficult for these to be added in as items. Would definitely be time consuming, and reaalllyy hard to get them to look right.
Perhaps using a texture pack would be better, no? The ones linked above are really good. I know it's not technically what you're looking for, but it's better than nothing.
Although, if there was an option for a character's body to be fluffy, or an item that allowed that, I'd use it excessively. Lol.