Christ, our High Priest, in Revelation: Jamieson, Fausset and Brown

down to the foot -- ... The garment and girdle seem to be emblems of His priesthood. Cf. Exodus28. 2, 4, 31; LXX. ... His being in the midst of the candlesticks (only seen in the temple), shows that it is as a king-priest He is so attired.

Jamieson, Fausset, and Brown's commentary on Revelation 1:13, "down to the foot"

(Jamieson, Robert, Fausset, A. R., & Brown, David, A Commentary, 4 Vols, Toledo, Ohio: Jerome B. Names, 1883-1884, New Testament, vol. 2, p. 515.)