Let's talk about the word "standards"

[ALAYMAN]

It was a firm statement because a musician said it was. Therefore everyone else with long hair or a beard or wire rimmed glasses or... well they agreed with said musician by wearing the style of the day, thereby confirming their guilt by association.

For whatever it’s worth, speaking anecdotally, both my wife and mother have vestiges of expectations that they ought to wear a dress to church. Neither grew up IFB, nor gleaned it from their time in an IFB church. It’s related to cultural norms of that era more than any explicit doctrinal teaching.