There are no size markings and size is based off measurements. This shirt is in excellent used condition with no obvious flaws or issues.
Feedback is of course always important, especially for us sellers. I make sure to leave all buyers positive feedback as soon as payment has been received. As a buyer, you have done your job! In return, once the item you have purchased from me has been received and you love it and enjoy it and cherish it forever, please don't forget to leave that positive feedback. It goes a long way!