I found the following interview transcript about this matter both insightful and intriguing. It's between Aniza Damis and Malaysian Department of Islamic Development (Jakim) director-general Datuk Wan Mohamad Sheikh Abd Aziz.
My personal favorite among the question and answers,
"Q: The problem is, when it comes to the level of society, the understanding of this fatwa might be different. For instance, at the moment, a lot of men?s clothes have become unisex for women. So, for instance, on the days where I am going to a particularly rough place, I might wear a shirt and pants, and I might not wear earrings or bright lipstick. If someone sees me at that time, what would be the conclusion that person might have on my sexual preference?
A: That is a different issue. We are currently talking about normal conditions. If we talk about situations like you mentioned, then that?s the same as a male policeman going undercover as a woman."