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The first thing I check is whether the pink has any grey or brown knocked into it, because the ones that don't tend to look like a hen party favour rather than a pair of trousers. A good pink has some depth to it, a bit of dust in there, like the inside of a rose before it goes over. If it's flat and bright with nothing underneath it, it'll fight with your skin instead of sitting next to it.
Fit is where most pink trousers go wrong before you've even got them home. They're nearly always cut as a fashion piece rather than a proper trouser, so the waistband can be an inch out from the rest of the sizing you're used to, and the fabric is often thinner than a navy or black version in the same shape, which means it clings exactly where you don't want it to. Sit down in them in the shop, don't just stand there admiring yourself in the mirror like a lemon. If the fabric pulls tight across the thigh or the pockets gape open when you sit, that's not going to improve once you're out the door. Go for a looser leg if you're between sizes, pink has a way of making a snug fit look snugger, it's an optical thing, nothing to do with you.
While you're in there, check the lining if there is one, because unlined pink trousers in a lighter shade can go a bit see through under shop lighting let alone daylight, and you do not want to find that out on a bright afternoon. Check the seams too, pale colours show up loose stitching and puckering that you'd never notice on black.
These earn their place from late spring through to early autumn, when the weather's bright enough to carry a colour with that much presence. I wear mine with a plain white or grey top because the trousers are doing enough talking on their own, and a leather jacket over the top takes the sweetness out of it if you want that. They're no good in deep winter unless the fabric's got real weight to it, a thin pink trouser on a freezing day just looks sad, like you got dressed for a different season by accident.
The one mistake is buying them a size down because you've convinced yourself pink is a "nice" colour and nice colours should be worn fitted. That's nonsense, pink doesn't need to be tight to make its point, and a trouser that's slightly too snug will spend the whole day announcing itself for all the wrong reasons.
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