This is the most tedious part of doing anything to a team's uniforms in CFB Revamped. The Hex Editor is only needed to change the chin strap, the chin guard and the face mask (unless you choose to replace a team that already has that color for their facemasks). To make it a little easier on anyone else trying to do this, I'm going to drop the codes I've found here so we can have a bit of a library.
These are the strings you're looking for
facemask_mat (the string goes after "baseColor." The "." will show as "00")
chinStraps_mat (the string goes after modColor." The "." will show as "00")
chinGuard_mat (the string goes after modColor." The "." will show as "00")
RED
3F 30 B0 B1 00 00 00 00 3D B0 B0 B1
WHITE
3F 80 00 00 3F 80 00 00 3F 80 00 00
NAVY
3C 43 F6 D0 3C 43 F6 D0 3C 43 F6 D0
BLACK
3D F5 C2 8F 3D F5 C2 8F 3D F5 C2 8F
GREEN
3C A0 A0 A1 3E B2 B2 B3 3E 90 90 91
FCS WEST FACEMASK COLOR
3D D8 D8 D9 3D D8 D8 D9 3D D8 D8 D9