All hat and no cattle

Derives from people wearing cowboy hats as fashion, but who are not actually cowboys

ALSO

Big hat, no cattle All hat, no ranch

All boy and no cow

all bark and no bite

all bluff and bluster

all booster, no payload

all crown, no filling

all foam, no beer

all hammer, no nail

all icing, no cake

all lime and salt, no tequila

all mouth and no trousers

all shot, no powder

all sizzle and no steak

all talk and no action

all wax and no wick

all motion and no meat

all show, no go

all fur coat and no knickers

all retch and no vomit

all fart and no poo.

all garnish and no meat

all buckle and no belt.

4-H vs 4-show