HAT

See: AT THE DROP OF A HAT, BRASS HAT, HANG ON TO YOUR HAT or HOLD ON TO YOUR HAT or HOLD YOUR HAT, HIGH-HAT, KEEP UNDER ONE'S HAT, OLD HAT, PULL OUT OF A HAT, TAKE OFF ONE'S HAT TO, TALK THROUGH ONE'S HAT, TEN-GALLON HAT, THROW ONE'S HAT IN THE RING.