Don't apologize, you were extremely reasonable! I can understand what you're saying: you wouldn't want to be a diva and bitch about a small event that offers only S, M, and L. Sometimes that's all you can afford even if it won't work for some short, tall, or particularly swole people. However, that's not remotely what's happening here.   Due to vanity sizing, the equivalent of offering only S, M, and L is offering only XS, S, and M. Starting their offering at S is the equivalent of starting at M back in the human-majority days. Of course it will cause problems! If they offer sizes as large as L, it's completely reasonable to expect not just XS but XXS, because modern XXS-L is the equivalent of human XS-XL.   They're offering 2XL! Probably vanity 2XL!! It would be reasonable to sarcastically ask for sizes fitted for severely underweight women, since they're offering sizes not just for obesity, not just for severe obesity, but for morbid obesity. But all you want is a petite size, not even a slightly underweight size!