They are one of thousands of cheap polyester costume vendors from overseas. Their work may be inexpensive, good for short term use and easily identifiable as a specific character, but just don't expect a shred of accuracy to their costumes both in terms of materials and patterning.
If you're looking for a costume that might be a step above the things you'd get at Spirit Halloween, this might be for you, but if you're serious about costuming or want something more authentic there are better options.