Can you please let us know which console you are on? Did you attempt to download the content via in game store, or console store? The Holiday Pack was made available for the Xbox 360 and PC on the 12th, and will hit all other consoles on the 18th. See here for more information: Twitter / InfinityWard: Download in #CODGhosts for ...
The Festive camo pack will be available on December 18, 2013 for the PS3 and PS4.. Since it's still not available, you will experience an endless amount of loading time. But, if you just go to the Season Pass selection, you will be able to load it and if you have it, download it.