I just want to start off by pointing out that this advert was not made in maya. Xsi was used here.
They where given body scans and head scans of all the players. The problem was that once these characters where all rigged up and all the motion capture was placed on them, they looked like plastic figures. There was no wrinkles and folds in the cloth. They where very unconvincing.
If this project was done in maya I would have said lets do some cloth simulation. Or use wrinkle maps. But since this was xsi we did not have these options.
Instead I created morph targets in zbrush. Wrinkles matching body twists and basic arm movement. These where then blended into the character based off certain angles of the bones.