I use Solidworks Expert 3D/2D software for leather pattern modeling then touch it up with Photoshop after then export the results to PDF using adobe . but the procedure i use is very complex to novice person, so i recommend something simpler even though solidworks output an extremely precise measurements. if you give it the right commands, but i don't recommend it for even intermediate users as certain features are extremely complex to achieve, and might put too much strains on you if you don't know what you doing.
for example here is one design image i did in solidworks, but still need some more stitching.
good luck with the image , indeed it was nice design.