Declension table of ?nirvastra

Neuter	Singular	Dual	Plural
Nominative	nirvastram	nirvastre	nirvastrāṇi
Vocative	nirvastra	nirvastre	nirvastrāṇi
Accusative	nirvastram	nirvastre	nirvastrāṇi
Instrumental	nirvastreṇa	nirvastrābhyām	nirvastraiḥ
Dative	nirvastrāya	nirvastrābhyām	nirvastrebhyaḥ
Ablative	nirvastrāt	nirvastrābhyām	nirvastrebhyaḥ
Genitive	nirvastrasya	nirvastrayoḥ	nirvastrāṇām
Locative	nirvastre	nirvastrayoḥ	nirvastreṣu

Compound nirvastra -

Adverb -nirvastram -nirvastrāt