The Diary of Samuel Pepys
Sunday 9 May 1669.
"This day I first left off both my waistcoats by day, and my waistcoat by night, it being very hot weather, so hot as to make me break out, here and there, in my hands, which vexes me to see, but is good for me".
" and my waistcoat by night". Does he mean at night as in bed?