Tops are usually pullover style and bottoms are pull-on with elastic waistbands. One-piece union suits use a front zipper (either full-length or front-half) for easy on/off.
Available styles include 2-piece sets, 3-piece sets (top plus pants and shorts), 4-piece pajama sets, and one-piece hooded union suits.
Common combinations include short-sleeve tops with matching shorts, long-sleeve tops with matching pants, and 3-piece sets that include a top plus both pants and shorts for mix-and-match wear.