I loved the sleepshirt but unfortunately had to return it as even a size XL was too tight even though I usually buy size 14 clothes. Sadly they don’t make a XXL. I had this problem with Pajamas once before, L was too small but managed to change for XL which fitted. When ordering online specially it is important for items to be true to sizes.
Love the print, the quality of the fabric and the design. My only suggestion would be that the sizing be more generous. I am not a huge lady (size 12) and ordered an XL thinking it would be oversized, more comfortable for sleeping given that the fabric has no stretch. The XL appeared to be the right size for me. I generally would take a Medium, sometime Large in clothes. So advice would be to size up, depending on how you like your fit when sleeping.