Matchesfashion.com will launch a 90-minute delivery service on 5 December.
Shoppers will be able to order from 6.30am until 10pm. In addition, customers within the M25 will be able to book specified hour deliveries up to seven days in advance.
It has partnered with CitySprint for the service.
Ulric Jerome, chief executive of Matchesfashion.com, said: “This brings the luxury industry into the ‘buy now, wear now’ era. Customers will be able to order from their mobile phones at breakfast and have a new outfit ready to wear for their first meeting of the day. It will transform the customer experience.”