Bottoms are the category where sizing goes wrong most often, so the direct answer is simple: buy by the measurement chart, not by your jeans size. Waist labels on rep denim and cargos are inconsistent, and the fix is to measure a pair you already wear flat and compare waist, inseam, thigh, and rise against the listing's chart.
Once the order is placed and Kakobuy's QC photos land, pants and shorts have a handful of specific things worth checking:
Fabric matters as much as fit. A heavy raw denim behaves nothing like a thin stretch blend, and cargos live or die on the weight and structure of the fabric. If the material is a selling point, ask the agent to confirm the hand feel of what's in the warehouse.
Two things beginners forget: shrinkage and drop. Cotton-heavy denim and chinos can shrink in the wash, especially in the inseam, so if length is already borderline, account for it. And stretch fabrics loosen with wear, so a snug waist on day one may relax.
Pants are moderately heavy and fold compactly, which makes them good filler for a consolidated box. Use Kakobuy's free storage to hold a pair or two and ship them alongside a jacket or hoodie order rather than on their own, so the shipping weight is shared across the parcel.