Adam Clarke on Job 30:18

Is my garment changed - There seem to be here plain allusions to the effect of his cruel disease; the whole body being enveloped with a kind of elephantine hide, formed by innumerable incrustations from the ulcerated surface.

It bindeth me about - There is now a new kind of covering to my body, formed by the effects of this disease; and it is not a garment which I can cast off; it is as closely attached to me as the collar of my coat. Or, my disease seizes me as a strong armed man; it has throttled me, and cast me in the mud. This is probably an allusion to two persons struggling: the stronger seizes the other by the throat, brings him down, and treads him in the dirt.