Waistcoats, commonly referred to as vests today, with respect to a three-piece suit, are a classic part of a gentleman's clothing. Often today, although the terms "waistcoat" and "vest" are synonyms, the former is often used in reference to the more traditional formal or semi-formal low-cut style such as that sold by Ralph Lauren. "Vest", by contrast, is frequently used to refer to the taller component of a a three-piece suit, and that is often mistakenly worn at weddings despite its incongruity being an affront to the pomp and ceremony the event is often built upon.
Even the weak become strong when they gather. I am most impressed.