Always make sure you look at the top of your game with an 18th century pocket mirror. The swinging cover protects the mirror and the little loop at the top can be used to hang it so you have two free hands to tie that cravat or straighten your tricorn.
It is larger than it appears in the picture. Light enough to not worry about weight with reenactment gear. At 3/4 arm length you will see your face and neck so perfect for tying your cravat or arranging your hair. The mirror itself is about 2 1/2" x2" on mine.