When evaluating cotton corduroy, the most critical factor is the wale count (the number of ridges per inch). Standard corduroy typically ranges from 8 to 14 wales, while 'pinwale' can exceed 16 to 21 wales for a finer texture. You must also verify the fabric weight, usually measured in GSM (Grams per Square Meter); for trousers, a weight of 280-350 GSM is ideal, whereas lighter shirts require 150-200 GSM. Additionally, ensure the material is 100% cotton or specifies the exact spandex blend (usually 2-3%) if stretch is required for comfort.