1859 fashion plate from the "Gazette of Fashion", showing both male and female daywear, with sea bathing scene in the background (including <a href="https://en.wikipedia.org/wiki/bathing_machine" class="extiw" title="en:bathing machine">bathing machines</a>).  The man is wearing a "sack coat".
Unknown 1859 "Gazette of Fashion" artist
1859
Scanned by H. Churchyard from page 462 of the 1st edition of Blanche Payne's <i>History of Costume</i> (1965)