It was briefly mentioned how odors can come into play with a down garment and if you do happen to smell something funky coming from your vest, it may not have properly cleaned down. It is a manufacturers responsibility to ensure that the down they are using is clean and odor-free, or hypoallergenic. Even when they state it is, there is a chance that they simply masked the smell with certain spray-on chemicals. Unfortunately, this remedy to the odor will not last forever.
Thankfully, as you now know, goose down typically has less odor than a duck down. Thus, if you see a vest with goose down (which most on this list have) you need not worry about odor too much. But, the only true way to get an odorless down is for the seller to thoroughly wash it.