the jobs that would get the most use out of Osode would be Ranger, Bard, Bst
I'd put MNK 4th on the list
RNG has no other body piece that offers that much STR (and AGI, though AGI is not incredibly important), and defense (and with RNG low HP Pool + Cassie Earring, the 30 MP would convert to 30 HP), the only other body pieces for ranger that are comparable would be the cotehardie's and the JSE Body Armors, both of which are pretty shitty
Bard's use for Osode is obvious, the 30 MP, +10 VIT & High Defense for absorbing damage, and +10 CHR, nuff said
BST's use for Osode: See Bard, plus +10 STR (Although BST should carry Haubergeon/Hauberk/Byrnie for Melee damage, Osode isn't a great piece of gear for gaining TP as STR by itself with no Attack does little for your melee damage)
It's true that MNK get's a benefit from individual stats on the Osode, however in terms of damage output only, I'd put MNK behind RNG, as MNK's also have access to Shura Togi which IMO is a better meleeing body piece than Osode
NIN's use for Osode is uh... I guess macro swap for WS, though I'd personally rather use a Shura Togi or Koga Chainmail for meleeing, swap to Haubergeon(+1) for WS, as Osode has no accuracy, and Blade Jin/Blade Ku are both multi-hit weaponskills, Scorpion harness is better for an evade-build than Osode is, Byrnie/Haubergeon/Shura Togi/Koga Chainmail are all better for melee + WS gear than Osode also