The knit vest has come back strongly enough over the last few years that we’ve gone from slightly uncertain about it to genuinely enthusiastic which isn’t something we expected. The layering potential is the main thing. Over a shirt it creates a look that has some of the layered intentionality of wearing a jumper but with the collar and cuffs of the shirt visible which adds a detail and a finish that the jumper alone doesn’t provide. Over a long sleeve tee it works as a more casual version of the same thing. The fit matters quite a bit because a knit vest that’s too large tends to look shapeless and one that’s too small creates an uncomfortable tightness across the chest when layered. A slightly fitted version that follows the torso without pulling is the right territory. Neutral colours integrate into existing wardrobes most easily but a deeper colour like forest green or burgundy adds something more interesting without being too demanding to style around.