jothar- I don’t know R’moshe teshuvo on women and tzizits but it is well-knwon that chassidic rebbetzins did wear a talis koton,because they wanted to be “mekayim’ the mitzvah.
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BS”D
Which ones? Rebbetzin Izevel Tzoiah Yachne of Creedmoor-Creedmoor does not wear one as far as anyone knows but who can see under her burqa anyway? Rebbetzin Lilac Blossom Prunepit Mc-Call Schmoigerwoman of Creedmoor-Alcatraz is indeed a feminist when she is halfway conscious but she is in far too elevated a spiritual state to wear a tallis koton.