Breeders...Question on Puppy Coats

Hi!

Quick question.... I'm getting really worried & stressed out that people are going to be disappointed in the coats of Daisy's F1 pups. Everyone wants a fluffy fleece coat and I am extremely honest and upfront with every little thing. I've even told some people that I think they should get an F1B or a multi gen instead of an F1. I would rather they be totally happy with a dog from another breeder than unhappy with one of mine. On some of these pups, you can see a slight wave or ripple of hair, and even the "stripe" down the back that has been mentioned before. Is that a sign that it will be more of a fleece coat or is there no way to tell at this point? At 4 weeks are you able to tell the coat type better? That is when I'm having people come and pick out their specific puppy so I'm hoping they will be able to tell. Help! A stressed out breeder!! :?

THX!!!