Women's Knitwear
Knitwear is built to stretch to the body in a way woven fabric isn't, so a sweater's flat, laid-out measurement is deliberately smaller than how it will actually sit worn — a size medium knit can measure closer to a woven small before you put it on. That's the fabric doing its job, not a sizing error, but it also means a flat measurement alone can't tell you how a sweater will fit the way it can for a shirt.
Fibre content decides how well that stretch survives repeat wear. Wool and wool blends have natural elastic recovery — they stretch to fit and spring back. A pure cotton knit stretches too, but recovers poorly, so a cotton sweater tends to grow and stay grown at the elbows and hem over a season, while the same cut in wool or a wool-elastane blend holds its shape longer.
Gauge (how fine or chunky the knit is) is the other variable a size label doesn't carry: a fine-gauge knit sits closer to the body at a given size than a chunky-gauge knit in the same nominal size, because the chunky yarn itself is adding bulk the pattern has to account for. Checking the fibre composition line next to the size chart tells you more than the size number alone.
Women's Knitwear at retailers
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BYLINE MERINO WOOL SWEATER
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ATTICUS MERINO WOOL SWEATER
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BYLINE MERINO WOOL SWEATER
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ATTICUS MERINO WOOL SWEATER
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OATS MERINO WOOL SWEATER

Banana Republic Factory
Merino Wool Johnny-Collar Sweater

Banana Republic Factory
Merino Wool Ribbed Sweater
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FINE MERINO WOOL PASTURE SWEATER VEST
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BARE MERINO WOOL BLOOR SWEATER
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ESSENTIAL MERINO WOOL VIEW SWEATER
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ESSENTIAL MERINO WOOL ANGLE SWEATER
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HERITAGE KNIT MERINO WOOL CREW SWEATER
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FINE MERINO WOOL PASTURE SWEATER VEST
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BARE MERINO WOOL BLOOR SWEATER
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ESSENTIAL MERINO WOOL VIEW SWEATER
Aritzia
ESSENTIAL MERINO WOOL ANGLE SWEATER
Aritzia
HERITAGE KNIT MERINO WOOL CREW SWEATER

Banana Republic Factory
Merino Wool Boatneck Sweater

Banana Republic Factory
Merino Wool Turtleneck Sweater

Banana Republic Factory
Merino Wool Shell Sweater