Tubular bandannas or buffs, popularised by the reality show "Survivor," are versatile, stretchy, tube-shaped cloth accessories suitable for use as headbands, neck wraps, wristbands or tube tops. Though traditionally woven into a seamless tube, you can make a similar accessory by sewing a piece of patterned, stretchy fabric. Tubular bandannas are useful for absorbing sweat and keeping wind out of your ears, eyes and nostrils.
Cut a piece of polyester fabric into a square, using a rotary mat and cutter. The buffs used in "Survivor" are 18-by-18 inches, but you can cut your bandanna larger or smaller to fit your needs.
Fold the fabric in half with the wrong side out. Pin the long edges of the fabric together, using straight pins.
Sew the fabric along the pinned edge using a zigzag stitch for stretchiness. Turn the tube inside out before wearing.