Turn the suit jacket inside out so that the lining faces outward. The lining will protect the outside of the suit while rolled and packed. Leave the sleeves right side out so they remain protected as well.
Fold the suit jacket lengthwise along the mid-back seam.
Fold the suit jacket a second time the same way so that the suit is now folded in quarters lengthwise.
Fold the suit over onto itself so that the collar is touching the bottom hem. Fold a second time in the same manner so the suit jacket is now in the form of a loose and wrinkle-resistant roll.