noun-modifying (irregular)
Describes something that is tastefully stylish or has a refined, fashionable flair, often with a slightly understated or casual elegance. Used prenominally.
彼女はいつも小洒落た服を着ている。
She always wears stylish clothes.
この辺りには小洒落たカフェが増えた。
The number of chic cafes has increased in this area.
お洒落 is a more common and general word for 'stylish' or 'fashionable', used as a noun or na-adjective. 小洒落た is a prenominal adjective with a nuance of being 'a little' or 'casually' stylish, often implying understated chic.
Derived from 洒落る (しゃれる, 'to be stylish') with the prefix 小 (こ, 'small, a little') and the past/attributive form た, literally 'became a little stylish'. The kanji 小洒落 is ateji.