Your dilemma is one that most blogger run across. Looking at both options above either one would be good for your fashion blog but to be totally honest, If I were into fashion and I ran across those names, I probably wouldn't visit your site because the names just don't appeal to me. However, I might be more likely to visit your fashion blog if it were named Miasfashionblog.com. The reason I say this is because any blog that has the first name in the .com makes it more personable and inviting. These are just my ideas. So I say go with the 3rd option and it will help people identify you along with your fashion agendas for your site.