Lyn: I remember interview day for residency and wearing a black skirt suit and all the internal medicine residents were in scrubs and looked scraggy ( is that a word?).The interviewees were easily recognizable by our well combed hair, suits, nylons and nice shoes!
I think psych is different because you are not running around doing procedures and dousing multiple fires at the same time.As in you would not show up in scrubs to interview the applicants.
My current work place: anything goes except closed shoes are a must, no jeans and trimmed fingernails. Just yesterday a patient told me she was so glad Dr's did not have to wear starched coats all the time ( I don't and more and more physicians are choosing not to). As far as ties on men go there is a fabulous study on how much MRSA and other germs are really harbored on doc's ties. Aaaaaaaaaargh.
The internal medicine residents I trained as recently as 2 yrs ago often wore flared skirts and heels. Yes, we sometimes rolled our eyes in the backroom about how the younger generation wanted it all but as you know it is a rite of passage.
Go with your gut and your happiness quotient. The attendings will always look more formal unless they are younger. Don't sweat the small stuff. But yes best to assume that on interview day a more spruced up look is better. ( as in more traditionally formal).

I didn't see the other comments but...looking at the photos you posted, the thing that stuck out to me is the styles, they are more classic, straight edged cuts and often in your WIWs they are floaty, soft, edged cuts. I don't think you have to give up your love of prints (or colors) maybe just change up some of the shapes (instead of twirly skirts, maybe pencil skirts for example.)