Go to the nearest shopping center and ask for plaid pajama. Not sure where you live but in the US some dollar stores sell plaid trousers which should be even cheaper. It should cost only five US dollars. If you don't wanna go topless then find a white cotton t-shirt (which you probably have somewhere in the drawer). Use a pair of scissors to cut a "v" down the middle of collar. Optionally you can also grab a belt that you wear on top of the t-shirt. Voila! You're a gaelaiche.

Bosh boooossh booooossshhh!