Returns are difficult to say the least
I ordered two costumes, Raya and Sersi. Neither fit, but the Raya one was workable so I kept it and had it altered. I mailed the Sersi costume back because I happen to live in Edison where mailing to China at an affordable price is possible. But otherwise it would not have been possible to return as the shipping would cost something like 50 or 60 dollars. Shipping took over a month and I had to follow up to get my return. They said I'll receive the credit in 1-4 days.