Available styles include one-piece hooded union suits (hooded sleepers) and multi-piece cotton pajama sets, commonly sold as 4-piece sets with tops and bottoms.
One-piece hooded sleepers use a full-length (inverted) zipper, while the cotton sets have pullover tops and elastic-waist pants.
The one-piece sleepers include a snug, character-style hood integrated into the design for extra warmth.
Fleece one-piece sleepers are described as made from flame-retardant fleece materials, while the 4-piece cotton sets are 100% cotton and noted as not flame resistant.
One-piece sleepers are described with a straight leg and regular fit, while the cotton 4-piece sets are described as a snugger fit.
A typical 4-piece cotton set includes two tops (short- or long-sleeve crew necks) and two bottoms (pants or shorts).