Accordingly with the wiki, 1.9 introduces a new feature: Overlay layers (hat, jacket, sleeves, and pants) correctly render semitransparent pixels, instead of only fully opaque and fully transparent pixels.

Is possible to reproduce this with SkinPort, or it was already implemented?

Thanks in advance!

I need to wait for mcp to support 1.9 and look it up, as myself actually doesn't know how to do that.