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I've heard people claim this but haven't tried myself - I'm wondering if it's dependent on lines or if all should be able to be feather sexed. Am hatching a batch in 6 weeks and will definately try!
It may be dependent on lines but when I ordered my sex SLWs from a hatcher, they were feather sexable, the females feathered out faster than the males, same with the Buff Orps.
In order for them to be feather sexable, they have to be bred for it. For instance, you would breed a fast feathering roo to slow feathering hens. Hatcheries do this for some breeds. Breeders typically do not.
I had a GLW that was the slowest-feathering, biggest chick in my bunch of rainbow layers from McMurray. It stood very much like a little roo, and I decided early on that it was a roo. It was a seriously ugly, un-feathered 6 week old when the rest of the pullets were sleek and pretty. She turned out to be one of my prettiest hens. I wouldn't count on being able to feather sex them at all.