If there are rules at the church you are attending, you should ask the leaders what they are. We do not know. At our assembly we have no rules per se. We do, however, believe what the Bible says about how women should dress: 'A woman shall not wear anything that pertains to a man...' (Deuteronomy 22:5); 'That the women adorn themselves in modest apparel, with propriety and moderation, not with braided hair or gold or pearls or costly clothing...' (1 Timothy 2:9); 'Do not let your adornment be merely outward--arranging the hair, wearing gold, or putting on fine apparel-- rather let it be the hidden person of the heart, with the incorruptible beauty of a gentle and quiet spirit, which is very precious in the sight of God' (1 Peter 3:3-4).
I think if you consider these verses carefully, you will know what is appropraie dress for a godly women.