I was recently watching a TV series named Suits where a character said "Oshkosh by Gosh". I googled it and all I could find was the meaning of bagash from this site.
What does this expression mean?
The scene was one where Harvey Specter and Mike Ross were high at Mike Ross's place, from Suits Season 2 Episode 10 (video):
Mike: Oh god, wow. I just got an image of you as a dad. With a little Harvey Specter all hair-gelled and like, pinstripped Oshkosh B'gosh. "Dad, don't play the odds, play the man. It's a win-win!" and you being like, "Go to your goddamn room." (TVTropes)