Alexanderom - I concur with Irish Dave's sentiments about 'Congress Gaiters' (elastic-sided shoes/bootees). They were quite common as evidenced in numerous period studio and other photographs of the era. These would be a great match for a sack suit were you to go that way. These shoes almost require a boot jack to remove, fit the foot well, are snug around the ankle, and are quite comfortable in general.
I ordered mine from Robert Land some time ago and have not been disappointed, though this is true with all of his historic reproduction footwear. Of interest, Land's Congress gaiters have integral tabs - one in front off and one behind the ankle. These tabs are very important as you'll see when putting on the shoe, you'll need them to effectively pull the shoes on over your ankles. I recommend your being seated for this operation (i.e. I found out the hard way that standing while putting on this type of shoe of is not a good idea).
Here is a link to his excellent reproduction product if you’re keen to see them (scroll down to see "Gentleman's Congress Shoe" type 1 and type 2):
http://www.robertlandhistoricshoes.com/servlet/Categories?category=1861-65+men%27s+shoes+and+booteesBrass