Try a pair on with the pockets actually loaded, keys, phone, the lot, before you decide. Flat and empty on the hanger, every pair looks fine. Loaded up, half of them sit like saddlebags on your hips and the other half pull the whole waistband down on one side. Worth sorting that out in the changing room rather than on a walk somewhere, because a good pair of cargos is one of the most comfortable things you'll own all summer, and the bad ones are a genuine punishment.
In an ordinary wardrobe they do more than people expect once you stop treating them as a going out item. A plain fitted top, something with no competing detail since the shorts already have plenty going on, and a simple trainer. I wear mine with a white vest and an old denim shirt tied at the waist, nothing clever, and they look like they've got somewhere to be even when they're just going to the shop for milk. They're also handy against a busier top you're nervous about, a loud floral or a stripe, because the khaki or stone calms the whole thing down rather than fighting it.
If you've none in your wardrobe at all, start with a straight leg in a mid khaki or olive, knee length or just above, not the baggy skater fit and not the tiny short short either, both of those are harder to wear well and neither does you any favours on a bad day. Cotton with a bit of structure to it, not the thin stretchy stuff that goes see through the minute you bend over, which I learned the hard way in a garden centre, never again. Check the rise too, sits on the hip is forgiving, sits right at the waist needs a bit more confidence about what's on show when you sit down.
The difference between a good pair and a sad one is mostly in your hands before you've even tried them on. Pinch the pocket flaps, they should sit flat and close properly, not gape open like a letterbox. Look at the stitching round the pocket corners, that's the first place they go. Press the poppers or buttons, cheap ones feel hollow and loose straight away. The fabric should have a bit of weight to it, hold its shape when you scrunch it in a fist, and the belt loops want to be wide enough to actually take a belt, not just decorative. Fold the hem over too, a proper one lies flat.
Whatever you do, don't buy a size down thinking the pockets will balance it out. They won't. You'll just have tight shorts with heavy pockets, and that's the worst of both.