A shop that sells clothing and related apparel items.
A new clothing store opened in front of the station.
洋服店 specifically means a Western-style clothing store, while 衣料品店 is a broader term for any clothing store.
ブティック is a loanword from French 'boutique', often implying a small, fashionable shop, whereas 衣料品店 is a more general Japanese term.
Compound of 衣料 (いりょう, 'clothing') + 品 (ひん, 'goods') + 店 (てん, 'store').