This one's super-easy (which is why you can buy large numbers of that design cheaply at wholesale). All you do is tie the shirt as for a typical spiral (see the
Spiral Fold Tutorial), then drop it into an immersion dyebath, or squirt it all over with a single dye color after presoaking in soda ash in the usual way for tie-dye. If you want to do a dozen or more just alike in the same color, use the
washing machine method to dye the tied shirts all at once. Try doing just one first to check your spiral-tying skills.
Paula