Start by defining the primary use and desired level of formality. For everyday wear or quick, comfortable dressing, elastic-waist options like Andora Elastic Waist Plain Pants or Comfy Plain Basic Elastic Waist Navy Sweatpants offer flexible fit in navy cotton. If you need a neater silhouette, opt for regular or straight cuts such as Regular Fit Regular Hem Cotton Trousers or Regular Fit Straight Leg Cotton Trousers in navy, which provide cleaner lines. Sizes vary, with elastic waist styles offering M to XXXL, while formal cuts use numeric waist sizing like 32.