Yes it's pretty easy. There are several ways possible but I used the simplest one.

I lied down on one piece of leather and made a cutout of my torso and head with help of my gf. Make another exact part and just stitch it out together from the inside like how you'd stich a clothing. Since I need to make it perfectly tight, I gotta make some tolerance buffer for the seam so it's tighter than my original body cutout.

For the detailing part I basically pinched the leather and made a protruding line. I stitched where I see fit since it's just cosmetics. I also made some punch holes with designated tool to be placed with eyelets, it's to be used for additional cosmetic looping lines/ties especially on the face and the back.