Gekkou is a wig/costume shop on taobao. It is known for its very distinctive wig head and colourful logo.
Gekkou's images are stolen by others... not uncommonly, on Ebay. I don't know if the Gekkouwig site is affiliated with Gekkou. If anyone proficient in Chinese wants to read Gekkou's taobao page for confirmation, let us know.
However, I found just now that Gekkou is itself not innocent of photo theft.
Compare these two images! (Screenshots - I couldn't attach because keeping the url bar made the images too big)
Here's a screenie Gekkou's page for Inori Yuzuriha's wig:
Classe's light/dark comparison for its Pro line Pink 03 colour:
Gekkou used a cropped version, so I circled where you should compare the striation.
It is fully possible that every other image Gekkou uses is their own, or they had rightful permission from cosplayers to use. But the fact that they did still steal an image should at least give a potential buyer pause before buying.