Many Survivalists and Bushcrafters carry at least 1 bandana they have multiple uses, sling (1st aid), headwear, doodrag, crude water filter the list goes on and on, I'm not one for preaching to the choir so I'll get to the grit of the post.
You can buy a bandana for a couple of £ on average, these tend to be a little small for some of us but buying a larger rag will of course bump up the price:
Step 1: Grab an old T-shirt and a pair of scissors
Step 2: Split up the sides so you have two pieces of material
Step 3: Once you have your material you can tidy up the edges by putting a hem a around or if your a lil caveman leave it raggedy
Step 4: Try it for size
Of course you can always cut straight across the chest/back area at the armpits but either way you get 2 XL Budget Bandanas for a little effort, works out cost effective even buying a T-shirt’s from a charity shop just for this purpose.