In my opinion you NEED to keep silkies in the breeding. If you start going sg to sg you end up with strippers.
They lose more and more quality and with that feathering. My goal was to breed to the very best type silkies I could find. I have two pens most years, this year I am starting with three, one with showgirl pullets/hens and a silkie rooster and then two with all silkies. I sold my breeding sg cockerel last season or I would have him in with silkie hens/pullets. It has been explained already but the naked neck is dominate so if you SEE IT, you have showgirls and if you don't...you have silkies.
I have my whites where I want them, extremely good wings, combs, toes and feathering. I have blue, black, splash and now lavenders. Buff was my orginal color attempt but for those of you who raise buff, they are HARD to get right. I only have one buff showgirl as of now and she is in a nice breeding pen of buffs. I will hatch some if I keep carrying this little hen in the breeding pen. So, you can mix a pen with them and all is well. You will get 50% showgirl, 50% silkies. I started breeding showgirls but with that I have aquired a nice group of silkies.
There is nothing cuter than a just hatched showgirl
The lavenders are stunning with the dark skin and light pastel color of lavender. I won't be selling lavenders till next fall and that is IF things go right. I should get these started lavs breeding back to lavender in a few months and then the progress should pick up.
All showgirls show AOV in the silkie breed. I feel since you need to keep breeding back to silkies they might need to be recognized as another variety of silkie rather than a new breed. I think of it like frizzles, in that you don't want to breed a frizzled back to a frizzled but a hard feathered bird. AND there are frizzled showgirls as well as silkies.