The present invention is a garment sizing system that that identifies the correct garment size for a particular garment type for a plurality of brands. In an embodiment, the garment sizing system is a client-server system that uses at least one server to host a website, garment sizing software, and at least one database. The consumers access the website over a communication network using networked devices. The database is populated with garment data such as garment type, brand name, brand line, retailers that sell that sell the brand, garment size, and dimensional garment measurements. Using the website, the consumer inputs the consumer's body measurement or the size of a specific garment that is known to fit the consumer, and the system retrieves and displays from the database the correct sizes for a specific garment type from a variety of brands based on the inputted data.