You can think of a haberdashery as a box opened out into a room. Nothing in it is a finished piece of clothing: it is all the small parts that go into one — buttons in narrow drawers, reels of thread on a rack, zips behind the counter, ribbon by the metre. From that one picture the word reaches in two directions. It can name the room, and it can name what fills the drawers. American English took the same picture and hung men's hats and ties in it instead.
From the word’s history
Wiktionary derives the word from haberdasher plus the ending -y, which turns the seller into the place where he sells and the goods he sells.
Wiktionary 把這個字拆成 haberdasher（賣這些東西的人）加上字尾 -y。-y 把「賣的人」變成「他賣東西的地方」和「他賣的貨」。這正好說明為什麼同一個字既是店，也是店裡的貨。
Wiktionary entry for haberdashery, etymology: From haberdasher + -y (nominalizer). Source ref kaikki:3f6f69a190036ae4:1073576363:15979
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