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.
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
Two branches
賣小東西的那家店
這一支就是核心畫面本身：一個空間，裡面收著別人做衣服要用的零件。兩個意思差在架上放什麼貨。
noun · C2
A shop, or a part of a large store, that sells the small things people need for making and mending clothes: buttons, zips, thread, needles, ribbon and lace. This is the usual British English meaning.
縫紉用品店
抽屜裡那些貨
鏡頭從店面推近到抽屜裡。同一個字不再指那個空間，而是指裝在空間裡的那一堆東西。
noun · C2
The small goods sold in such a shop, taken all together: buttons, zips, thread, needles, ribbon and other things used for making and mending clothes. This use is uncountable, so it has no a and no plural.
縫紉材料（總稱）