Pool for collecting art with characters wearing costumes designed by Azazel1944 https://twitter.com/azazel1944
and manufactured by Waimengshe https://twitter.com/Waimengshe
The account is both owned by the cartoonist (azazel1944) and cosplayer (CAN), they even have a tag here: azazel1944
The designer retweets pictures of cosplayers wearing the costumes they made, there's even credits on them sometimes.
Here's their official Taobao store for more info on their designs https://ymsyms.world.taobao.com/index.htm