This is an irregular feature - both in frequency and oddness - dedicated to a word I came across that I have never previously used.
Balbriggan (BAHL-brig-ahn) n. A type of knitted cotton - typically unbleached - often used in underwear. The fabric is usually napped on one side, and we in the United States refer to such garments as "long underwear."
Balbriggan is also a town in North Dublin, Ireland, now forming a part of County Fingal. Not surprisingly, the town's textile industry is credited with the name behind the hoisery.