How to tell a good sweater vest dress from a poor one

A sweater vest dress looks simple, but the knit, the trim and the cut decide whether it lasts a season or ten. Here is what to check before you commit to one.

Start with the label, not the colour

A sweater vest dress is a sleeveless knit that sits over a shirt or a turtleneck, so the fibre does most of the work. Cotton blends hold their shape and feel cool against a collar, though they run heavier. Wool and wool blends add real warmth and bounce back well, but some people find them scratchy at the neck. Acrylic is soft at first and cheap to make, and it is also the fibre most likely to pill. A small share of elastane, around two to five percent, helps the ribbing spring back. A label that lists one plain fibre and nothing else is telling you something, and so is one that lists five.

Look at the knit itself

Hold the dress up to a window. A dense knit blocks most of the light, while a loose, thin one lets the shape of your hand show through and will stretch out at the hips. Squeeze a handful of fabric and let go. Good knit recovers quickly, and poor knit keeps the crumple.

Then check the trim. The ribbing at the V neck and around the armholes should lie flat, with no curling edge. If it ripples, the neckline will gape the first time you pull the dress over your head. Seams should be even and snug, and the hem should not flare outward like a bell.

Fit and length are partly taste

Some things can be measured. The armholes should be cut high enough that a shirt underneath does not bunch at the underarm, and the V should be deep enough to show a collar without exposing the whole shirt front. A side slit at the hem makes walking easier in a slim cut.

Length is a matter of taste. A hem above the knee reads young and works with tights and boots. A midi length covers more and suits a flat shoe, though it can swallow a shorter frame. Neither is wrong.

Last, read the care instructions. A dress that needs hand washing and flat drying is fine if that suits your routine, and a poor choice if it does not. Knits also stretch on a hanger, so in a one rail wardrobe, a folded spot on the shelf keeps the shoulders true.