Not sure, but I think the guys would've been wearing some form of low rise boots that sported hook and eye closures.
I've often wondered where DS got their costumes. I imagine that interior sets would've been easier to do. IIRC back in the day, you could get late Victorian and early 20th Century furnishings for little to nothing. My aunt has a house full of the stuff that she purchased on the cheap at yard sales and estate sales in the 50's and 60's.
Clothes don't hold up as well as furniture, do they? They probably couldn't have simply bought old clothes. It was probably a chore to make the actor's costumes, and given the show's notoriously limited budgets... Maybe that accounts for why Ange and some of the others (Beth and Rachel come to mind) only seemed to have a couple of outfits.
Then again, I've always heard that prior to the advent of modern conveniences like washing machines, people didn't have many clothes. That still doesn't account for Angelique's limited number of frocks. Couldn't she just whip up a Worth gown, or whatever?
BTW, didn't Ange look like a total floozy in her pink and gold dockside outfit? Aristede obviously thought he was going to get lucky, then whammo! Guess he got a little "choked up" when he found out she wasn't really interested.