Angie, yes absolutely, the book could still be about style renewal - the title is about the outcome of the process. And "the do it yourself guide to self-renewal" would be a great subtitle - the "you" bolsters up the "do it yourself" part beautifully.
Other reasons.. let's see...
I guess "Look Fab" and "You Look Fab" are just as punchy, but the latter boldly speaks to the potential reader. I like that.
The "and feel fab" part, I have to admit, has me stumped. If I saw this title on Amazon, I'd wonder if your book had chapters on vitamins or exercise or something?
Ultimately, you already have the web site domain! For me, that's the big clincher. The book would sell first to your blog readership. Then those who hear about it elsewhere through publicity or word of mouth, if they google for more information, they will find not just the book but your blog site too.
But of course, I'm not in the book business! So take my recommendations with a grain of salt!