Here is a little thing to help your impression; a good reproduction handkerchief. Every man would have carried at least one. South Union Mills has a number of spot on reproductions. For the small fee of $18.50, you too can posses one of the most essential, valuable tools an Infantryman has had since the dawn of time.
Here is another one, with no monetary cost; know what you are talking about when speaking with the public. The topics of discussion here cover a huge range of subjects, from the war, equipment, arms, foods, politics and all other sorts of 1860's aspects of life. Not everyone wants to know what the thread count of a particular garment is or what the twist of rifling is on a 1855 Springfield. Having a broad range of topics for discussion aide in drawing in and keeping the civilians listening.