She packed clean underclothes into the suitcase before the trip.

She packed her underclothing carefully into the suitcase before the trip.

She packed several underclothings into her suitcase before the trip.

The parents underclothe their child during hot weather.

The costume department underclothed the models for the photo shoot to achieve a minimalist aesthetic.

She carefully folded the undercloths into the wooden chest before closing the lid.