I am reading a short story (set around 1976) by 魏微 (born in 1970 in Jiangsu, studied in Nanjing). The word 衣衫 repeatedly occurs. I searched the net and found references from 紅樓夢 and 唐詩, but the short story is among the easiest I have ever read, making but sparse use of 成語 and fancy vocabulary.
My dictionary defines 衣衫 as clothes. Is there a difference to 衣服？ Any regional flavour, literary flavour or era related flavour for which one may choose it?
I searched jukuu and it seems to be rare outside fixed expressions. 魏微 uses it quite casually: