Theory is a staple clothing line in the US and now that it has expanded to the UK, it has opened a store in Westbourne Grove and now here in Marylebone High Street. The store as all of the Theory stores, has a very simple subdued decoration, with emphasis on good lightning, great styling on mannequins and in general good visual merchandising. The clothes are simple, elegant, and with perfect fit. Specially the trousers, they have a really flattering cut that camouflages the tummy and enhances the posterior (subtlety). The fabrics they use are of prime quality. Id say it's easy to wear fashion, timeless and of good quality. The service is attentive and the prices in a medium range. read more