I'm 5'6" 130lbs and I ordered an Eevee size regular and it fits perfectly. I was sceptical on the size because I have longish legs for being my height. I have a little extra room length wise. It's very soft like wearing a blanket. I was surprised that the inside is soft.
Got a Tigger onesie, it had no pockets but I was aware of that before I made the purchase. It fits well, could've gone with a large instead of regular but they were out, but the regular is amazing anyways!
I love the costumes I've bought from this shop. They're speedy in shipping and provide quality material. If there's any complaints I have, it's that I wish there were more extra tall kigurumi!
I have a kigurumi of my own and love it! It has lasted for a few years, is easy to clean, and is so comfy and well-made. I just ordered one for my sister, and it came quickly and is perfect! Will buy again.