1 Timothy 2:9
NKJV - 9 In like manner also, that the women adorn themselves in modest apparel, with propriety and moderation, not with braided hair or gold or pearls or costly clothing.
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1 Timothy 2:9 is not specifically talking about dressing to go to church. It is instructing us how we should dress all the time. And I strongly believe we should dress to go to church the same way we dress other days. If we think the clothing we wear during the week is not proper to wear to church, then there is a problem. We are to worship God all throughout the week. That includes worshiping Him with the kind of clothing we wear. We are to dress modestly at all times.