I just picked up another heroic nude bust with drapery on either shoulder. The difference is the obverse bust P F AVG verus P AVG
Maximianus (286-305), antoninianus, issued c. 290. Siscia, second officina, 3.69g, 23mm.
Obv: IMP C M A VAL MAXIMIANVS P AVG; Radiate bust right, heroically nude, with slight drapery on both shoulders.
Rev: CONSERVATOR AVGG / B / XXIKOY; Maximianus, holding sceptre, and Hercules, holding club, standing facing one another and sacrificing over tripod between.
RIC 581var.