You'll likely have to make it tighter than it seems comfortable being, because the cushioning of the feathers will work against you and provide a space for them to get their legs under the wrap, and an easy way for working it loose.
I had to resort to a layer of masking tape held in place by a further layer of duct (duck!) tape. Two females I have wrapped this way did very well and found their legs; my first female was tough and the male I just had was even tougher, didn't think I'd ever get him wrapped right so he could walk too. So a lot depends on the duck, and frankly having even one happen this way seems like too many and you generally don't get that many compared to how many ducklings are born. But it can be done, you just have to not give up or lose heart if you wind up stripping a bunch of feathers in the process. Sometimes the wrap will need replacing or need to go back on after being removed and it just has to be dealt with. I have tried everything and this is what I have found works best for me with squirmy little Houdini ducks that grow too fast to be able to predict from one time to the next just how much they will grow and when.