My last post on the Wolfe reminded me that I’d seen another picture that showed an unbuttoned fly. Bit later than 1640, painted post restoration by Isaac Fuller and showing the flight from Worcester of Charles II in 1650. Perhaps this is a comment on the construction of common clothing, or an attempt to show what was a current fashion statement. The English Antick also has an unbuttoned fly, one of the list of his ridiculous antics being “His codpiece unbuttoned and tied at the top with a bunch of riband”
The 1640s Picturebook 