Feather length is specifically sexlinked by fast-feathering rooster over slow-feathering hen. Such will result in slow-feathering cockerels and fast-feathering pullets, because the fast-feathering (wildtype) is recessive to slow-feathering.
However, because the gene is sexlinked, cockerels receive two copies and pullets receive one. Because cockerels are double-factor, the gene will express better--thus, cockerels of a fast-feathering breed are likely to feather faster than females of the same breed. Wyandottes are slow-feathering, and because cockerels have two copies of the slow feathering gene, they are
likely to feather out more slowly than the females are.
This
only works if the variety is true to type. Thus, it often will not work with birds sourced from a hatchery, or whose parent stock was sourced from a hatchery and not selectively bred. It does work with purebreed Leghorns (fast) OEGBs (fast) and with Plymouth Barred Rocks (slow.)
(Not my image)
See how the cockerel has a very short tail, and the pullet has a longer tail?