day clothesとは意味・読み方・使い方

From day +‎ clothes.

dayclothes pl (plural only)

(somewhat uncommon) Synonym of daywear. [from 19th c.]
- c. 1853, Jacob Abbott, “The Arrival” (chapter XI), in Rollo on the Atlantic, Boston: W. J. Reynolds & Co., page 208:
  
  Accordingly, that evening, when bedtime came. Maria and the children did not go to bed, but they lay down upon the couches and in their berths, in their dayclothes, awaiting the summons which they expected to receive when the small steamer should come.