Oh my I'm sorry for the late response, I didn't get the notification I had a reply on this and I only now remembered I had posted this >_> . Ok so I tested it again with just making a simple skin in the editor and got the same result reguardless if the skin was imported or not.
Steps I took: I made the skin as a steve, then changed it to an alex model via clicking "Edit" then clicking the "convert to alex/steve" option.
What I mean is, in the
MCSkin 3D program you download, when you convert skins it doesn't edit the skin pixels of the arms, it changes the skin format/outline around the pixels, which is what it should do. But the issue I'm getting is when I use the
PMCSkin3D on the pmc site, it doesn't just convert the format/outline of the arms, it actually crops out arm pixels or expands them based on which model you're converting it to. Because of this, the arms often get messed up.
Here is the Steve skin(edited on PMCSkin3D):
http://prntscr.com/muc2iaHere is what the arms look like after changing to an Alex model:
http://prntscr.com/muc1zIt deletes any pixels outside the skin outline/border, which it shouldn't because it messes up the design.
This is a screenshot from the
MCSkin3D program for reference, and what the pixels
should look like when converting the model:
http://prntscr.com/muc8lx 
Status: Closed
Opened by -Turtle7-
- Finished
Importing a skin into PMCSkin3D and changing the model type, crops the arms and arm layers even though its the right format.
When I import an alex skin, I go to change the model to an alex model but when it changes the model, it also crops out pixels and makes the arms(and arm layers) offset/smaller. It is like when you try to use an alex skin on a steve model and there is that visible black line on the arms. The change model option is cropping the arm pixels smaller than it should be. Since the skin was already an alex model to begin with, it shouldn't be cropping the arm pixels when I change the model. You can get a better picture of the issue if you view the 2D view when doing this.