I made this guide if you see anything wrong let me know i will change it.
First:
from level 1 to level 7
collect 48 cowhides
(like 2 times walking in lumbridge) cost 40gp for tollgate.
In the desert there is a tanner which can tan your hides. Make 48 cowhides to 48 soft leathers. (Cost 48 gp.)
Buy a needle and thread in the desert i reccomend to buy like 100 thread cause you will need it later. cost varies mostly like 3 gp each.
take the needle and the thread in your pocket and take as much as possible soft leather. Then use needle with leather and choose for gloves. Make 48 gloves to reach crafting level 7.
After that get another 20 cowhides to get crafting level 9. This will only take 1 load of hides so 20gp at toll gate must be enough.
*Another way is to get a few hides before start crafting.*
As soon as you have reached level 7 make leather boots to level 9. It goes the same as the gloves.
when you reached level 9 of crafting you make 79 leather cowls to level 14.
After you have done this make 57 to get crafting level 18 now you can make all soft leather stuff.
Here you can see what it cost. The prices may varie a bit cause the price of thread varies. normally you can make like 4-5 things with 1 thread out of soft leather. In my price calculation i have 100 thread.
Total cowhides: 204
Thread used: 40-45
Tanning cost: 204gp
Toll gate*: 160gp
Needle: 1gp
Total: 365gp
*this is when you havent completed prince ali resque*
here is a picture *thanks to alexandr* which shows a spot to get cowhides, the tollgate, the tannery, the bank and the shop were to get a needle and thread.
so far 4 now later on i will extend him to level 70