You should be fine. If you're overly concerned just ask your maker to add an inch or two or so all around (I'm adding a few inches for a commissioner who thinks their dummy was a bit tight too. It's nbd).
I just finished this guy up http://www.furaffinity.net/view/15269021/ http://www.furaffinity.net/view/15269049/
Fleece can look good. It just takes a bit more care to work with because it doesn't hide blemishes like fur does.
Gonna start off with an unhelpful comment about how this is hella ambitious if you've never done this sort of thing before. But hey, you're asking for help for and seem pretty involved with wanting this to turn out nice. Which is more than can be said for most, so I wish you the best of luck...