Good morning,
Jim's dating has to make him a militia man. He is wearing the 1855 infantry tunic, changed to single breasted in 1856.
The pointed cuff came in in 1868 outlined in white braid with a chevron of white lace below. In 1871 the chevron was removed and the braiding formed into a trefoil.
So he is wearing an outdated tunic with up to date embellishments which is typical of the militia. They were often equipped with the regular army cast-offs from their parent county regt.
Cavalry tunics mostly had shorter or no skirt as in the link given. They also had plenty of braiding across the front. Not only cavalry wore pill box hats.
John915