I have 3 white silkies 1 is definitely a male he is smaller than my female, few pictures of him, not the best quality but I think you can see the black comb on him the females only have furry where his black comb is. There still young but I do believe this is my only Cockerel
Lady I got my Silkie from made sexing Silkie a bit easier for me. Cockerel/Rooster have longer feathers on their heads that stick out, plus redder and larger combs and wattles. Also they get more wing feathers and aren't as fluffy as the Pullets.