John Gill Commentary Job 27:16

"Though he heap up silver as the dust, And prepare raiment as the clay;" — Job 27:16 (ASV)

Though he heap up silver as the dust
Which, as it denotes the great abundance of it collected together, so it expresses the bias and disposition of such a man's mind, that he cannot be content without amassing great quantities of it, and also his diligence and success therein, see (1 Kings 10:27) (Psalms 39:6) (Habakkuk 2:6) ;

and prepare raiment as the clay ;
not merely, for use, but pomp and show, to fill his wardrobes with; and formerly, raiment was part of the treasure of great men: the phrase signifies that he might have such a variety of raiment, and such large quantities of it, that he would value it no more than so much clay; or else that his riches, consist of what it would, would be both polluting and troublesome to him; the Septuagint version reads "gold" instead of "raiment", as in (Zechariah 9:3) , where like expressions are used of Tyre.