How do you know? We never thought the Jockey was a suit either.
Because it was slang, just like Electronic Ball Breakers, but GBX are taking everything seriously.
Btw you don't know for sure if the Jockey is a suit since Prom is not in the canon.
Anyway just like Hicks, I like the design but I just don't like how they connected it to the movie referenced as "SHARP Sticks".