You guys do realize that, if you actually read the information description tab, all leather in the game has been stretched, scraped and tanned.
If you remove the hair from a hide, there is very little difference between pig leather, deer leather, reptile leather and bird leather. Once it gets stretched, scraped and tanned, it will almost literally "behave" the same, whether in regards to clothing-making, insulation, etc.
Just put it all together in "hides". I can't tell you how many times I have had scraps of leather floating around my base that was useless, because I "didn't have enough" to make something.
If you remove the hair from a hide, there is very little difference between pig leather, deer leather, reptile leather and bird leather. Once it gets stretched, scraped and tanned, it will almost literally "behave" the same, whether in regards to clothing-making, insulation, etc.
Just put it all together in "hides". I can't tell you how many times I have had scraps of leather floating around my base that was useless, because I "didn't have enough" to make something.
Humans didn't create it.