Fit2Buy is an online fitting room. It works by letting you compare items from your own wardrobe you know fit you to items a retailer offers online.
Fit2Buy scales your item to the retailers item perfectly and then overlays the images on one another meaning what you see is what it would look like if you had both items laying on one another in front of you.
You can then compare the two items and because you know the item from your wardrobe fits you, if the item you want to buy is a similar size you know it will fit you as well. Its as simple as that, and everything can be done online.