1 Timothy 2:8-9 NKJV
"I desire therefore that the men pray everywhere, lifting up holy hands, without wrath and doubting; 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 things"
Accept for this saying that lifting up hands is biblical

This says a few things I guess commenly misunderstood.
Why did Paul write this? What is the reason for this? "in like manner" == has something todo with holyness.
Lets just think for a moment here. What could be wrong with a women walking around in a bikini in church? Well accept that she might get a cold, it would GREATLY DISTRACT THE MEN!!! yes people Paul talks about the lust of the eyes! Just like in Pauls time there are today many many men that struggle with lust that are in the church. Many men come out of porn addiction affairs and all sorts of messed up things. We don't need girls running around in clothing that says: Look at me! ect. ect.
What is wrong with women wearing pants? well I guess it depends on the cut.
What is wrong with women wearing shirts? well I guess it depends on the length.
I hope this makes sense