Littlest Pet Shop Pajamas

pet shop
a shop where pet animals can be purchased
Kids' film about a couple of aliens who come to earth disguised as a Cowboy and Cowgirl and buy a pet shop from its owner in an attempt to try and eat some of earth's children for dinner.
A pet store or pet shop is a retail business which sells different kinds of animals. Pet stores also sell pet food, supplies, and accessories.

littlest
Little is a surname and may refer to *Andrew Little (footballer), Northern Irish footballer currently playing for Rangers.
(of a person) Young or younger
Denoting something, esp. a place, that is named after a similar larger one
Small in size, amount, or degree (often used to convey an appealing diminutiveness or express an affectionate or condescending attitude)
Littlest means very small.  You make the the word by adding -est to little.  When something is the littlest, it is smaller than everything else that's similar to it.  For example, the littlest monkey is smaller than the other three monkeys that are playing together.

pajamas
A suit of loose pants and jacket or shirt for sleeping in
(pajama) (usually plural) loose-fitting nightclothes worn for sleeping or lounging; have a jacket top and trousers
A pair of loose pants tied by a drawstring around the waist, worn by both sexes in some Asian countries
(pajama) a pair of loose trousers tied by a drawstring around the waist; worn by men and women in some Asian countries
Pajamas, also spelled pyjamas (see also spelling differences) can refer to several related types of clothing. The original paijama are loose, lightweight trousers fitted with drawstring waistbands and worn in South and West Asia by both sexes.