Part of the humor is that different groups of cowboys are dressed in costumes from different eras of westerns: Roy Rogers 50's-style vests, spaghetti western trench coats, etc.
“Roy Rogers 50’s-style vests”
The Texas A&M band?
“You should watch ‘Silverado’ if you haven’t already.”
Exactly! The costumes and bizarre stereotypes were typical Hollywood.
For example, there were Black cowboys in the old west. But none dressed up as Beverly Hills Dudes like Danny Glover. And Jeff Goldblum, in the west, wearing a “Say go to wardrobe and get a gambler’s suit from a Mississippi riverboat.” But this is the wild west!” “Who cares? The rubes will never notice.”
The only plausible scene was Kevin Kline after he was stripped and found a basic wardrobe. Then he suddenly gets some money and “Where do I order dude ranch deluxe clothing? Is there a Sheplers near by?”
And on and on.