Like the portrait of John Hutchinson, this picture by Dobson this time shows lace on the shirt opening visible through an open doublet.The lace matches that on the collar which suggest “en suite” sets if not attached collars. Porter was a fashionable chap and an art connoiseur – so would have I suspect been at the leading edge of fashion. Also note the blue ribbon waist fastening for the breeches.
The 1640s Picturebook 