Perforate a T-shirt? Sewing Machines Parts and Sales in Los Angeles

This may be a stupid question as I know nothing about sewing. My Google-fu has turned up nothing so I’m likely out of luck.

My company’s uniform is a 100% polyester shirt and being outside in the summer heat is brutal as these things do not breathe. Is there a way to perforate (aerate?) them to get some air circulation going? I don’t want it to be really noticeable like Right Said Fred or anything so subtle holes would be better. Ideally I’d like to do the entire shirt but if it’s too noticeable I bet doing just the back would help a lot.

Thanks for reading.