A tea wallet. Go. (But not the smartest way of going about doing it.)
Materials: 20x13 piece of fabric. 2 inch bit of quarter inch wide elastic. A button. ( you could also do this with snaps, but I can't find them)
Sew a quarter inch seam (Not pictured) down the long side of the rectangle. Press seam.
Fold ends in 1/2 inch; press. Sew closed with quarter inch seam.
Attach elastic on opposite side of wallet on inside of fold.