Just my opinion --
With so many individuals with a helpful nature, I find it hard to excuse tennis shoes and/or wearing a cowboy hats and or baseball caps. Same with long hair, e.g. pony tail or braids like Willie Nelson wears. Especially, when the regulations on both sides were very specific that hair was to be neatly trimmed. With the Confederate officers, other than the sleeve braid, their rank was on the collar verses the shoulder-boards on Union uniforms.
I can excuse someone wearing man's street shoes, as the man's shoe hasn't changed too much other than the square toe, but many a man is featured with laced street shoes and of course the Brogans. Those going out of the hobby sometimes sell their shoes, boots, etc.
There will be no way that everybody can be authentic as so many authentic items are gone forever or too fragile to handle in the field/reenactment events. However, it is my personal opinion, that it would be much better to wait and complete the outfit before stepping out with guys/gals who have put in their hard earned dollars to fit themselves as close to perfection of the normal / average soldier.
Seeing many a photograph, thanks to Wilber and others -- we (in a general sense) are seeing the myth of Confederates in rags and patches, are not the norm. So many photos of the deceased Confederates appear that they took real pride in their appearance and their uniforms weren't like "Lil Abner" torn and ragged.
Understanding the difficulties in finding shoes to fit a difficult size or feet that require orthotics --it would still be very much appreciated to get as close to the shoe standards as possible.
M. E. Wolf