Modal Nightshirt

nightshirt
nightclothes worn by men
A nightshirt is a garment intended for sleeping in. It is somewhat longer than most regular shirts, reaching at least down to the thighs, but usually shorter than a dress or robe, leaving some of the legs uncovered.
A long, loose shirt worn in bed.
A long, loose shirt worn to bed

modal
modal auxiliary verb: an auxiliary verb (such as `can' or `will') that is used to express modality
of or relating to a musical mode; especially written in an ecclesiastical mode
modal(a): relating to or constituting the most frequent value in a distribution; "the modal age at which American novelists reach their peak is 30"
A modal word or construction