I fill my normal cloth & iron BODs to turn in to get new ones, solely from buying from NPCs (otherwise the resources aren't worth it). On the rare occasions I get a normal 4-part 20-count tailor LBOD (spined kit), I might need to craft body sashes, full aprons or bonnets.
Otherwise, I've got too many BODs as it is to turn in for new BODs to craft stuff to fill cloth BODs. Leather BODs are the same, but at least there are some that can be used for skill gains to fill for my last two BOD runners (105 and 115 skill, both working to 120).
I'm more likely to fill exceptional iron smalls, as when I do mine, I mine in Ilshenar with gargoyle pickaxes and prospector tools, hoping to spawn paragon ore elementals for their paragon chests (or, ore elementals in general for their ore).
Dull copper, even if I choose to dig solely for DC using normal tools and PT, I can't mine in quantities to fill my existing small BODs that give POF, so filling small normals is a non-starter. They go directly to my junkpile book, and I give them away once the book gets full. Shadow iron normals and EX 20s (other than those that fit the plate large, for runner training and the 120 PS) also end up in the junk book.
There's no copper normal smalls worth keeping, and the 20% POF chance doesn't start for normal smalls until Bronze 20-counts, through Agapite 15-counts at 90%. Smalls above that that aren't for larges aren't worth the effort to bribe (save the bribes for LBOD filling needs).
IF you look at the guides and FAQs in the Data Chest section, while out of date in terms of collection methods and bribes, they discuss the logic in choosing what to keep.