it was made of one piece with the ephod, made of fine twined linen

This can be stated in active form. AT: "they made it as one piece with the ephod with fine twisted linen" (See: rc://en/ta/man/translate/figs-activepassive)

as Yahweh had commanded Moses

"just as Yahweh told Moses to do." See how you translated this phrase in Exodus 39:01.