When something fits perfectly, Koreans call it anseong-matchum — and that matchum ("fitting") really did mean made to order. In late Joseon, the town of Anseong in Gyeonggi Province was famous for brassware, known as yugi (鍮器). Anseong brass came in two kinds: jangnaegi yugi, mass-produced for sale at market, and matchum yugi, crafted individually to the buyer's measurements and taste. Anseong's custom brassware was so finely made and so sturdy that the saying "fits as if it were made to order in Anseong" became simply anseong-matchum. Later the word yugi dropped away and the link to the place name Anseong faded, so the term broadened into the general sense of "fits the occasion exactly." The craftsmanship of a single town became a word in its entirety.