What do words like 'balloon' and 'cocoon' in product names mean?

Placing several product names of LOW CLASSIC side by side reveals recurring words of a similar nature. Balloon in Balloon Down Jumper means a balloon, Wave in Wave Mini Sweater means a wave, Cocoon in Jersey Cocoon Fit Pants means a silkworm cocoon, and Curved in Wide-Fit Curved Cotton Pants means a curved line. None of the four refers to material or function; they all refer to form, and in clothing, such words are typically used to describe how the silhouette puffs out or wraps around.

The garments carrying these names are quite simple in themselves. Wave Mini Sweater is a short-sleeved knit woven from cotton-blend yarn ^[1]. Jersey Cocoon Fit Pants comes in three sizes—S, M, and L ^[2]—and uses koshiura on the waistband ^[3]. Koshiura is a sewing term for an interfacing subsidiary material applied to the inside of the waistband to prevent stretching and hold the shape. Wide-Fit Curved Cotton Pants is introduced shown on a 174cm tall model wearing size M ^[4].

hmmm, while a size chart provides total length and hem circumference, it does not tell you what kind of volume the garment will hold on the body. These names serve as notation that communicates in a single word the very part that numbers leave blank.