This stand collar is very loose at the top and sags down in certain areas to create a relaxed but still very clean look. The fabric looks like a wool as it's able to make the collar stand like it does.
This is an amazing collar that I have never seen before. It looks like cats eyes! It could definitely be created by draping a collar and sketching on the cut outs for ideal placement. You would most definitely need a stiffer fabric to pull this design off.
A ruffled collar, why not? The structure of this detail would definitely require a stiffer fabric to hold the shape. The neckline would be gathered extremely tight to allow for the collar to stay up right and appear like a fan.
I thought this collar detail was really neat because it's part of the shirt. It looks almost like a box pleat turned into a collar at the bust. The design could work with a variety of fabrics and produce different looks.