Simple custom I did during the COVID19 lockdown (hope you all stay safe). Essentially a custom cape.
I removed the stiff plastic cape (it's not glued on), which made the figure difficult to pose. I covered the gray neck with a piece of cloth matching the blue custom cape I made. I made it so the cloth neck has the V shape of the tendons in the front. The figure is much easier to pose now (but I did free the joints up with hot water as they were very stiff and likely to break).
I'll add more photos when I get a chance.