Rick,
Contact me at gurleybillyj@uams.edu and I will send you a copy of the Trower pic. Captain Trower is wearing a frock coat instead of a shell jacket. However, I do have photos of two artillerymen (Robert Young and William Hoskins) of Lesueur's Battery wearing shell jackets. The jackets appear to be gray with red lining on the cuffs and collar. I can send you pics of these men as well.
Bill