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Your post made me curious enough to look at what the minis manufacturers did. It looks like the command packs for early war Scotts tend to be a 50/50 mix and some have the sporran.
You brought up a point I forgot about... the officers (in all armies IIRC) had to purchase their own uniforms. I do remember reading through a forum post, on a WWI reenacting forum, wherein it was mentioned that the officers within the UK/CW armies were allowed greater leeway when it came to their uniforms more than officers in other nations.
Yes, and both might be right. I've noticed most if not all have sculpted them wearing the sword, which I thought was discarded by many from the start. Footsore Miniatures have the regular officers wearing the sporran but not the NCOs.