So what do you do if you want an assortment of different items made ?
Choose the proper leather weight (thickness), type (full grain, split (top or lower/bottom grain) for each item.
That said, It depends on the project.
Let's say I only have a half hide of any thick/heavy leather.
1. I want to make a new daily wear/work pant belt, Plain Jane. I cut the belt width, trim to length, attach a buckle, and punch the buckle holes, using the full thickness of the hide.
2. I want to make a nicer dress belt. Using that same thick/heavy hide. I'll cut and trim the hide to size, then I'll thin the thickness using a hide splitter till the hide is shaved down to my desired thickness, pull out my tooling dies, draw out a pattern on the leather, tool the leather, attach a buckle and punch the buckle holes.
Same scenario as above but I only have a lighter/thinner, a mid weight hide.
I'll cut 2 pieces out, trim, shave, mark, the hide accordingly, then "glue" and sew the 2 pieces together to get the desired thickness, attach the buckle and punch the buckle holes.
Not being a smart ass. It is what it is, or isn't. It's best to always use the proper thickness/weight leather for the intended project.
Same scenarios as above, but all the leather I have on hand to make a belt from is thin/light weight soft leather used for making possible bags, moccasins, lining leather, etc.
I go shopping for various thicker/weights, and types of leather to make my belt(s), with enough left over for other future leather projects.
NOTE: Not all dyes are the same. Thus In all cases whether factory dyed or I dye the leather I use and highly recommend using an inside leather liner to keep the leather dye from bleeding out onto clothing, firearms, etc, just in case the leather gets wet.
I hope this helps.