A shirt so hideous in it's loud garish design, that it is quite feasibly made from the cloth of a curtain. A combination of shirt and curtain becomes shirtain.
Wow, that dude must be brave to wear such a shirtain!
Shirtain is when your wife hangs up all the wet shirts from the washer to air dry on a overhead door ledge.
Dammit !!! Every time i walk through the shirtain half of the shirts fall off and i need to pick them up. I wish she would just get a clothes line outside.