Silkies are small chickens whose feathers lack the barbicels that hold them into a feather shape, so they look (and feel) like they're covered with fur rather than feathers. Silkies also have black skin, a dark beak and eyes, a dark purple (mulberry) comb and turquoise earlobes.
Turkens, or naked necks, are regular large fowl chickens that don't have any feathers on their necks, so they bear a passing resemblance to small turkeys.
Showgirls look as if they combine the two. They have all the silkie characteristics, along with the naked neck. However, they still have a pouf of a fluffy crest on their heads, and sometimes even a little spot of feathers on their necks like a fancy brooch.

They look like something out of Dr. Seuss... like the chicken version of a Vegas performer.
Interestingly, even the males are called Showgirls!
Showgirls are essentially Silkies with some unusual feathering, and typically share the same sweet, docile personalities as Silkies usually have.