I really don't care what any church or religion decides to wear or not wear. Whether it be homemade dresses, coverings, single suspenders, hijabs, burkas, Wal-Mart clothing, thrift-store clothing, or designer clothing. People and groups are free to wear whatever they want. Churches are free to impose whatever dress codes they want. The diversity makes the world a more interesting place. Although I do think wasting too much money on clothes is an unnecessary and wasteful extravagance.
Hmmm...I wonder what your response would be to a lady I know who is very conservative, wears a cape dress and doesn't sew her own dresses, (not that, that matters). Each year she gives her seamstress 9 or 10 pieces of fabric for new Sunday dresses. I can't even imagine going through that many dresses in a year. My point is that even if people dress more conservative, they can still be extravagant.
Then there are the women who wear cape dresses, which is a symbol of "plainness", yet those "plain" dresses are all dolled up with frills and the print is so bright, the flowers so big, they look like an oversized walking flower pot.
But each to their own. If that floats their boat, so be it.