women should adorn themselves in respectable apparel, with modesty and self-control, not with braided hair and gold or pearls or costly attire, but with what is proper for women who profess godliness—with good works.-1 Timothy 2:9-10
This is the verse most quoted by women who wear skirts/dresses only. Notice that it says we should adorn ourselves with good works. If a woman only wears long skirts, but lies, gossips, and disrespects her husband, would you think she adorns herself with good works?
Notice modesty and self-control are paired here. It's easy to dress modestly. Anybody can throw on a long skirt and button up a blouse, and still have the heart of a seductress underneath.
It's not easy to have self-control though. When your husband says something wrong or does something stupid, do you have self-control and show respect for him anyway? Or do you correct him publicly and humiliate him? Which shows good works?
I love wearing skirts and dresses. In fact, I wear a skirt almost every day. Skirts make me feel feminine and femininity is an expression of who God made me to be. I love the way I feel when I'm in a skirt. And compared to the tight jeans I used to wear, I definitely feel more modest in a skirt. Please note: I did not say all jeans are immodest.
Let's look at another verse:
Do not let your adorning be external—the braiding of hair and the putting on of gold jewelry, or the clothing you wear— but let your adorning be the hidden person of the heart with the imperishable beauty of a gentle and quiet spirit, which in God's sight is very precious.-1 Peter 3: 3-4
This is important: Adorning ourselves with a gentle and quiet spirit is very precious to God. It doesn't say that long skirts or dresses are precious in God's sight. It says gentleness and quietness are very precious in His sight.
As the Body of Christ, we need to open our eyes to see the truth. God's Word nowhere says we should only adorn ourselves in skirts or dresses. It says we should adorn ourselves with good works and with a gentle & quiet spirit.
And the Lord said, “Now you Pharisees cleanse the outside of the cup and of the dish, but inside you are full of wickedness."-Luke 11:39