The results of desynthing 100 serge aprons if anyone is interested;

315-316 desynth skill
100 serge aprons = 1366200 gil

24 nq/5 hq duriums 200k
31 nq/4 hq serge cloths 1.4 mil at 40k each
16 nq/5 hq serge threads 280k
4 clear demi 20k
37 fieldcraft 2 demi 80k
139 lightning crystals 70k
142 wind crystals 70k

Value of mats = 2.12 mil gil
Total profit = 753800

Duno if there is something better for weaver to desynth, aprons seems best though.