Dan, yes, they were often small, but some at least felt comfortable with them...I owned a nice small bag that definately appeared to have been made from a portion of aboot top, and have seen several others in various collections as well...
Since you have the boots handy, why not make the bag and give it a try in the field to see what you think? I personall think they go very well with later southern mountain rifles and poor boys...
TCA