So, I wanted to use a skin that has transparency, but the transparent parts on the body show up black. a friend tested it on her computer and it worked, but she does not have the up-to-date launcher with the skin picker. My suspicions are that it is something with the launcher. the skin that is not working is an attachment.
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Tested this out and it seems to be a problem with transparency when applied as an online skin. It renders as black instead of transparent. Not sure why or of any solution, but it's not the skin causing the problem.
You're not allowed to have transparent skins in Java Edition. See MC-49294.
Invalid. This isn't a bug related to Minecraft