The real test of a one piece isn't how it looks in the changing room mirror, it's what happens to the straps after the third time you've hauled yourself out of a pool or off a lounger. The good ones stay put on your shoulders. The bad ones creep inward all day until you're constantly hoiking them back up, which is a rubbish way to spend a holiday.
There are moments a one piece is the wrong call. If you want an even tan with no lines, it's not that. If you're after something you can adjust for a big lunch and a flatter stomach later, a bikini gives you that wiggle room and a one piece doesn't, it's fixed, take it or leave it. They can also be a faff for quick toilet trips at a festival or a day at a lido with only one cubicle free, which sounds trivial until you're stood there wrestling with wet fabric while someone queues behind you. As for what not to pair them with, skip anything too fussy on top, a heavily patterned sarong or an oversized statement necklace fights for attention it doesn't need to have, and skip flip flops that are already falling apart, because a smart cut swimsuit makes cheap footwear look cheaper by comparison, not the other way round.
What separates a good one from a sad, baggy disappointment comes down to the fabric blend and the lining. Look for a high percentage of elastane, anything under fifteen percent and it'll lose its shape by week two of regular wear, stretching out at the bum and the chest until it looks defeated. Matte finishes tend to hold their colour better than shiny ones, which fade fast under chlorine and sun cream. A proper lining, not just the one layer of fabric doing all the work, makes a real difference to how it feels wet against your skin and how long it lasts before going see through at the front. Check the stitching round the leg openings too, flat seams rather than a rolled edge that can rub after an hour of actual swimming rather than posing at the shallow end. Hardware matters more than you'd expect, a clip or ring at the back should feel solid, not like something that'll snap the first time you're tugging it over wet shoulders.
In the shop, stretch the fabric between your fingers and check it bounces back properly rather than staying stretched, hold it up to the light to see how sheer it goes when pulled, and actually sit down in it, because a swimsuit that gapes or rides up the second you bend is going to do that constantly at the pool.
A well made one piece does more work in a week than most of your going out clothes do in a year.
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