Sewaddle remain in their larval form far longer than most bug pokemon, and continually molt in the process of growing larger before evolution. Although their shed exoskeletons resemble the tree leaves which litter these pokemon's forest homes, they can be distinguished by their far softer texture. The tiny threads through which these pokemon sew their own silk-like shells – or through which their Leavanny mothers sew their first set – can be spotted even from a distance, if one knows what to look for. The young trainers of Pinwheel forest and other Sewaddle habitats commonly harvest these exoskeletons in order to sell them for spending money.
Molted Sewaddle skins can wrap around a human infant as easily as they can a pokemon, and can be sewn together to make remarkably comfortable blankets for older children to warm themselves through the harsh Unovan winters. Unlike Sewaddle, who seem to enjoy making new clothes for themselves as much as they enjoy wearing them and gladly abandon them with age, humans often grow attached to these blankets. Many prefer them over other fibers even when they have grown far too large for the blankets to be of practical use, although very few can afford large enough Sewaddle blankets or clothes to replace them. It is common in Unova for adults to keep a tiny, outgrown Sewaddle quilt between their pillow and their heads, so that when they sleep they do not forget the comforts of youth.
Despite the potential for significant profit, Sewaddle trainers refuse to sell their pokemon's coats except in times of dire financial need. Instead, they sew together the soft skins for their own use, often with their pokemon's aid, and claim a wardrobe as soft and comfortable as their Sewaddle's for the entirety of their lives.