'Gummy' is a builder on strike during the Tower of Life quest. During the quest, the player is required to assemble a builder's costume; the various pieces are acquired from the striking builders. Gummy explains that he was drying his trousers on a line by the shore when they went missing. Search the plants south-east of the tower for the scruffy trousers.
Players can pickpocket him to get a triangle sandwich and 8 thieving experience. Rogue equipment does not give double loot when pickpocketing this NPC.