I brought the optifine cape over paypal and it has been over 6 hours and I haven't got it yet.
my IGN is CryptomaticLogic and i'm still waiting for it
on the optifine website when I log on it says I dont have a cape at all.
The payment did go through I have the the 2 emails from optifine and the company I payed the money to
Make sure you have the right in-game settings on, like in skin customization make sure you have cape on. Also in the details section in video settings, make sure show capes is on.
Other than what was said above you would need to get in touch with the optifine guys as this forum is not linked to them.