Regular fit, or with an adjustable waist.Rain pants for hiking should fit snugly around the waist and hips, with a regular fit or an adjustable waist. They should also be long enough to reach and cover your ankles and ideally have a wide leg opening to slip them on over your shoes.The crucial thing to consider is that rain pants should not limit movement. That’s why most rain pants have a relaxed fit that allows moving and bending without feeling restricted — this also allows them to be thrown over the top of hiking shorts or other non-waterproof layers. Tight-fitting pants is a rare exception for extremely active sports, such as mountaineering or running.