Clean paintbrush 2 - 3 inch wide & Cotton Rag Material (Bradford on Avon BA15)

Hi

I doing some DIY - clear oil-based clear finish on woodwork. Does anyone have
- a paintbrush
- old clean flat cotton or tshirt material (clothes etc) to use as rags

Please - not with any paint on the brush!
I can pick up from Bradford on Avon or Trowbridge soon

(Im very low income!)