campestre
Could not find campestri in Logeion dictionaries.
campestri Noun: neuter dative singular, Noun: neuter ablative singular of campestre
Campester.
CAMPESTRE(se. subligar) was a kind of girdle or apron, which the Roman youths wore around their loins, when they exercised naked in the Campus Martius, whence the name (Augustin. de Civ. Dei, 14.17). The campestre was sometimes worn in warm weather in place of the tunic under the toga (campestri sub toga cinctus, Ascon. ad Cic. pro Scauro, p. 30, ed. Orell; Hor. Ep. 1.11, 18; Vulcat. Avid. Cass. 4). [W. S.]
(sc. subligar). A kind of girdle or apron, which the Roman youths wore round their loins when they exercised naked in the Campus Martius. The campestre was sometimes worn in warm weather, in place of the tunic, under the toga ( Epist. i. 11. 18).