Vests have long been a key part of formal attire, with three-piece suits often seen at the most elegant and sophisticated of events. This means that, for kids, vests can be a stylish addition to a suit for occasions such as weddings, communion and bar mitzvahs. Vests, though, can also work seamlessly with more casual outfits, offering a pop of sophistication to a weekend wardrobe when layered over a t-shirt or casual shirt.