Did a double take when I saw this thread. What a strange name for a clothing brand. "on the dickie" means having sex here.
Never even heard of that,

maybe it's a Scottish thing?!
I thought a 'dickie' was a bowtie or 'dickie-bow'?!
Isn't a dickie also one of those fake turtleneck things??
I wear Dickies T-shirts because they are heavyweight [meaning the material is heavy weight, or winter weight, it just means they are thick] and are built to last. I have a Dickies jacket for frolicking in the snow and their pants are good too.
Dickie see......Dickie doo! LOL