I love your items and the design is wonderful.
But for the comfort I think that the front en the back of your XL leggings could be a little longer. Now it is 35 in the upper back. That is suite as an M/L here in Europe. You could add at least 5 cm. That would be much more comfortable. I don t know if yiu had comments about the other sizes.
Otherwise you could create an XXL and then soecify the real mesurements.
I wish you a lot of success with your nice business