Required: Standard Infantry or mounted Sky blue trowsers.

Dark blue was officers or early war only.

Required: Period shirt

Required: butternut or dark blue is most common wool cover. Bullseye canteens are later war, smoothside canteen is most flexible.

plain 4 button sack coat is the best U.S. jacket for flexibility.

bracers (suspenders). Buy canvas or leather, stay away from elastic

black or dark brown slouch hat

black brogans - the old stand-by
You may want to add heel plates to extend their life

standard black belt

Standard U.S. buckle, except for officers may differ

standard U.S. issue black tarred haversack

Option: Forage or bummer cap is alternative to a slouch hat. Kepis (short) are only worn by officers

Option: Very useful in hot weather, buy this before a mounted artillery jacket

Option: Mounted artillery also wore red trimmed shell (buy a sack coat first)

Option: period shirt in solid or two color check.

Option: Artillery boots

Federal eagle buttons are probably all you will run into (outside of state militias which we don't do)