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The mistake is assuming white shorts are white shorts, and reaching for whatever's on the rail without checking what happens when the sun comes out from behind a cloud and hits them side on. White goes see through faster than almost any other colour, and a lot of pairs only reveal that once you're already out of the house.
Off white, ivory and a soft bone are far easier to live with than stark, bright white. They don't show every mark the same way, they don't go grey in the wash as obviously, and they sit better against most skin tones without that slightly clinical look pure white can have under certain light. If you do want true white, go for it, just know it needs a proper lining or a double layer of fabric to behave itself, and hold it up to a window in the shop first. If you can see the shape of your hand through it, you'll see a lot more than that outdoors.
On fit, the main thing to watch is the waistband gaping at the back while sitting snugly at the front, which happens a lot with white cotton because there's less give to hide behind. Try sitting down in them in the changing room, not just standing and turning. A good pair holds its shape without digging in when you bend, and the hem sits level all the way round rather than riding up at the sides. If you're new to white shorts, start with a tailored, slightly longer short in a mid weight cotton or a cotton blend with a touch of stretch. It's the most forgiving length, it covers more of the bit people worry about, and it reads as deliberate rather than accidental in a way that very short ones sometimes don't.
What separates a good pair from a disappointing one comes down to the weight of the fabric and how it's finished. Thin, slightly papery cotton creases the second you sit down and goes translucent at the first wash. A better pair has some density to it, a bit of structure, and doesn't need constant checking in a mirror. Look at the stitching on the pockets and the fly, cheap ones pucker there first. Check the button and zip feel solid rather than loose, and run your fingers over the inside seams, they should be finished, not left raw and fraying from the first wear.
Reach for white shorts on bright, warm days when you want something that looks deliberately put together without any real effort, against tan lines, with simple tops, when everything else in your suitcase or your drawer is darker and you want one thing that lifts the rest.
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