Don a uniform, 6 letters
Dress for a game, 6 letters
Get into uniform, 6 letters
Get ready for a big game, 6 letters
Get ready for a space flight, perhaps, 6 letters
Get ready for some football, 6 letters
Get ready to play, 6 letters
Prepare to play ball, 6 letters
Put on a uniform, 6 letters
Put on one's uniform, 6 letters