Find an embrodiery mama who's willing to do a skull and cross bones on a shirt for her.

Sheckie found a ... free I think... down load of one for me that I applicayed (I'll learn to spell that one day) to a shirt. I'd just find someone who will do one on a rtw shirt for you.
We kept 2 and gifted one. They are 2 of ds's fav shirts to wear. His 3rd fav T also has a skull and cross bones.

At least he love his mama made camp shirts even if they are not piratey.