The skull and crossed bones is a mortality symbol with a long history, from memento mori carvings to maritime warning flags and pirate lore. Most people wearing it aren't referencing piracy specifically but mortality, danger, or a rebellious streak. It reads as a straightforward memento mori piece rather than a narrative pirate image, since there's no hat, bandana, or eyepatch here.
Where it sits
This is a wide, roughly square composition with the bones extending diagonally past the skull, so it suits the upper arm, chest, or upper back where that spread has room to sit flat. Shrinking it down loses the stippled shading in the eye sockets and the fine linework on the bone joints first. Forearm placement works if scaled to keep the cross-bone angles from crowding.
Making it yours
Ask an artist for any of these.