Now, that's not to say that it is just okay for a woman to go all out wearing pants with all abandon. A Christian woman should dedicate her life to living a life of modesty. And that means that she seeks modest forms of style and attire regardless as to if she wears pants or not.
1 Timothy 2:9-10 (KJV)
In like manner also, that women adorn themselves in modest apparel, with shamefacedness and sobriety; not with broided hair, or gold, or pearls, or costly array; But (which becometh women professing godliness) with good works.