Declension table of ?nirvastra

Masculine	Singular	Dual	Plural
Nominative	nirvastraḥ	nirvastrau	nirvastrāḥ
Vocative	nirvastra	nirvastrau	nirvastrāḥ
Accusative	nirvastram	nirvastrau	nirvastrān
Instrumental	nirvastreṇa	nirvastrābhyām	nirvastraiḥ nirvastrebhiḥ
Dative	nirvastrāya	nirvastrābhyām	nirvastrebhyaḥ
Ablative	nirvastrāt	nirvastrābhyām	nirvastrebhyaḥ
Genitive	nirvastrasya	nirvastrayoḥ	nirvastrāṇām
Locative	nirvastre	nirvastrayoḥ	nirvastreṣu

Compound nirvastra -

Adverb -nirvastram -nirvastrāt