Should I choose Alpine Soft Shell Pants in my usual size?

They fit properly when layered, and run large when worn alone.

These pants from ostrya are designed to feature water-repellent and windproof functions considering alpine climbing environments^[1]. The overall width was made roomy so that thermal underwear or other clothing can be layered underneath to maintain body temperature in cold weather^[2][3]. If it is based on layering multiple layers of clothing during severe winter mountaineering, choosing your usual size will fit with room to spare^[4].

If worn alone, the criteria are different.

For someone who intends to be active wearing only these pants, the original roomy fit may feel somewhat loose and hover around the body. If you want to wear them with a neat, standard fit without excessive excess width, going one size down from your usual size is more natural to tidy up the silhouette^[5].

hmmm, the roomy leg width of these pants is closer to a design that reserves space for layering clothes in harsh environments, rather than a looseness meant for style.