Some thoughts on labelling pieces ... and then some!!
Early on, I saw the fancy pins that people had ... I made my own using those really long ones we used for OBWs and labelled with A-B-C's.
Found the pinning, sometimes too annoying. Plus somehow, some of the letters seemed to jump ship!! I the graduated to clothes pins labeled with the A-B-C's using a magic marker!
I have a stack of smallish $ $tore plastic bins (maybe 6"x8"x1-1/2"?) to keep control of these pre-cuts as I work with them or until I make the next block. Or if making more than one block at a time, I can use a bin for each block, and stack them up. Also, I pretty much press after every seam, so these bins work nicely for moving small pieces from machine to ironing board and back again, til they are together in bigger units or finished blocks. And are a huge help to avoid losing some of those itty-bitty's as I work my way through the assembly!
When I saw that others were using sticky notes, I thought, great ... tried that, but didn't take me long to say adios ... the sticky notes never seemed to stick (for me!) to the fabric, for long.
Now, mostly ... I tend to use green painter's tape for labelling.
It sticks well and stays on the fabrics without leaving residue.
Still use clothes pins, but this way, I don't have to look for every A-B-C!
Also, use the green tape to note size on stash yardage, so that at a quick glance, I know measurements of my stash pieces. Pieces over a yard, I fold one way and anything under a yard, is folded differently, more like a FQ. At a quick glance, I can eliminate or zero in on potentials. Simplifies my stash shopping strips!
When I set a project aside, I try (operative word being try!) to put everything together in a plastic box/bin ... including the fabric remnants/yardages too. Even if I am sure I am not going to use the rest of the fabric, it stays with the project through to the end. Learned that lesson too many times, when I decided to shift gears and change the original plan ... and could not find the fabric I needed. Or worse, had used it in a different project. YIKES!
Finally ... when I have a quilt top together. I make sure I make the backing and binding before I dispatch the leftovers back to my stash! I may or may not be quilting it right away, but for sure, I know that I have all that I will need through to the finish line!