The key for any blog in any niche is to create epic content whether that's blog posts, videos, images, podcasts, infographics, ebooks or whatever your audience like then getting your content in front of your ideal target audience.
Go where they are already (in your case it might be Pinterest, Facebook, fashion blogs and forums) and make your presence felt there (don't spam or annoy people) through sharing useful content (not just your own but others too), blog commenting, posting useful advice and answering questions, guest posting, get involved in social media hubs with lots of followers.
Then there's also paid ads like PPC (Adwords / FB), banner ads, solo ads etc.