Adam Clarke on Judges 8:24

Give me every man the ear-rings of his prey - The spoils taken from their enemies in this warfare. This is a transaction very like to that of the Israelites and Aaron; when they brought him their golden ear-rings, out of which he made the molten calf, Exo 32:2, etc. Whether Gideon designed this ephod for an instrument of worship, or merely as a trophy, is not very clear. It is most likely that he had intended to establish a place of worship at Ophrah; and he took this occasion to provide the proper sacerdotal vestments.