When holding an item in your hand and looking in your inventory your skin will become partially see through depending on where the opaque areas are
Edit: This happens with armor as well
Steps to reproduce
1 - Put on a skin that has opaque bits on the second layer
2 - Hold an item
3 - look at yourself in the inventory
Thank you for your report!
We're actually already tracking this issue in MC-165203, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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