My Merc has an early 50's Buck Roger's ray gun for the third brake light and some vintage molecular model nodding dogs.
I'd go with old candy bar and McDonald wrappers with just a touch of mud from your shoes. Maybe a dirty pair of gym shorts
If you go with the old school garter belt look only have one at a time hanging from the mirror. Make dang sure the one hanging matches the gal riding with you.
Shark tooth island necklace, hula girl, auto compass, & a California raisin surfer dude in my '56 Ford Ranchwagon.
I have an old wire cage "school bus" fan in my '36 pickup. It satisfied the DOT as a de-fogging device to get my title. Gary
I am probably less traditional than some but when I was in high school ( and after that) I usually had a church key in the glove box. If I had a dash there was normally a package of zigg zags on the dash. Sometimes there were some panties in the back seat, or on the package shelf but that didn't really mean anything I didn't score that often. Come to think of it I don't know how traditional they are but most of my cars have had one of those little Christmas tree air fresheners hanging from the mirror.
Beeno,I never pegged you as a cross dresser! I remember a friend of mine took a very popular young lady to the drive in theater one warm summer evening while his steady girl friend was away visiting relatives,as the story goes he got lucky and that was that until his girl friend got back to town and they were at a local dive having a burger and a malt in his 55 Chevy convertible and she opened the glove compartment to sit her malt down while eating. She noticed something white and silky,yes sir evidence of a recent victory and she got out of the car,went inside and called her dad. To my knowledge they never dated again and he said she kept his high school ring. HRP
had a few of those in my work vehicles. put an old ford heater motor in one and it blew like a hurricane!