It all depends on preference whether you want to layer your waistcoat, but Permanent Style explains that the reason for its silky texture is “to allow easy wearing and removal.” The silk is meant to give the jacket an easy glide-off and easy slide-on — all for comfort, all for convenience.

Why do suit vests have satin backs?

Vests are not properly worn without a jacket. They fit close to the body, and will be uncomfortable to wear in summer. Almost all suit vests are satin backed to fit more easily under a jacket.

What is the point of a waistcoat?

The primary function of a waistcoat is to provide both a sense of depth and formality to an outfit. The best way to wear a waistcoat, therefore, is beneath the jacket of a suit.