The style site will launch on 1 March - a week before Conde Nast's Stylefinder.com. Advertisers already signed up to the site include Nike and Tommy Hilfiger.
Cas Oja, founder of the site, said it will enable users to match designer pieces with high-street staples. It will also allow users to browse sportswear and beauty items.
MyStyleWindow is to back the launch with an outdoor campaign, created in-house, and a consumer PR campaign, handled by Ubiquity Communications.