Steve McQueen's 1921 Harley Davidson with sidecar

this tail light illustrates that the lighting for both head and tail lights was gas... not gasoline, the type that vehicles used, in this case it's carried in the shiny silver colored canister attached to the handlebars

one cool old Harley

 and it had this cool HD sticker

the back of the jacket says "Look at me" in an effective way. The bike says it in a subtle way