I am a 5'10'' 360 pound fat guy. I expected these things to not fit and that I'd have to send them back. When you have a 54'' waist, these one size fits all kind of deals usually don't work out that well. I was wary of these at first because even the onesies that claim to be able to fit fat people, tend to not fit me still. So I got one of the XL for myself and one of the regular ones for my girlfriend after watching the video of how those sizes fit on everyone. They just happened to have my favorite pokemon, Gengar, in the XL size and it fits perfectly. I have so much room and the little back spikes are cushioned which actually feels amazing to lay back on. Out of curiosity, I tried on the psyduck regular sized one that I got my girlfriend to see if it would fit me as well and sure enough, I fit in it just fine! I like the extra room that the XL size offered me however so if you're as big as I am, I'd stick with the XL. My only complaint is that there is a much more limited variety of the XL sized Kigurumis. I'd like to see a larger collection in my size, but I also understand that comes with a demand and there just aren't that many people my size. Overall, I'm extremely satisfied with my purchases and it was super convenient and awesome that both of our favorite pokemon were available in the sizes we wished! Keep up the amazing work and thanks for helping me feel accepted!