Most costume stores on this list have larger size or custom-size options, while a few do not. Costume selection: Some cosplay websites have all different kinds of costume in a variety of genres, while others specialize only in a specific genre. Widely renowned artist Alex Ross comes to life in the form of jaw-dropping cosplay. They have a large selection of cosplays and what’s nice is that they usually have the accessories/footwear to go with the costume, which saves you the hassle of having to find everything separately.