The mistake is treating the sleeve length as a minor detail, something to decide after the colour and the print, when it's actually the thing that decides whether the dress gets worn. Buy it a size up because the bodice feels snug across the top of the arm, and you end up with a dress that gapes at the chest and hangs loose everywhere else. The sleeve is the fitting point, not an afterthought.
In an ordinary wardrobe this length does a particular job that short sleeves and long sleeves don't. It shows a bit of wrist and forearm, which reads as more finished than a short sleeve but less formal than a full one, so it sits well under a cropped jacket or an open cardigan without bunching up at the elbow. A simple gold chain, a stack of thin bangles that don't catch on the cuff, flat boots or a low heel, all of it works without fighting the sleeve for attention. Structured bags sit better here than slouchy ones, because the proportion of the dress is already fairly neat and a soft bag can make the whole thing look unfinished.
If you've not got one of these in your wardrobe yet, start with something in a mid weight jersey or a ponte knit, in a plain colour rather than a print, because the cut matters more than the pattern when you're still working out what sleeve shape and dress length suit you. A straight or very slightly tapered sleeve is more forgiving across the upper arm than a fitted one, and it won't dig in if you spend the day at a desk with your arms bent. This length comes into its own in spring and autumn, when a short sleeve feels a bit exposed and a long sleeve feels too warm, and it covers you well for work, for a lunch that runs into the evening, for a christening where you need to look put together without overdressing.
Before you buy, check where the sleeve actually finishes against your own arm, not the model's, because on a shorter arm a three quarter sleeve can land as closer to elbow length and look stumpy rather than neat. Check the cuff isn't so tight it leaves a mark after a few hours, and that there's enough ease at the shoulder seam that raising your arm doesn't pull the whole dress up at the hem. Wash it inside out and on a cool setting to keep the colour from fading round the neckline first.
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