Principle #2 – You should dress appropriately for the occasion
Contrary to the modern meaning of modesty, the Biblical meaning of a woman dressing modestly means that women are to dress “appropriately”. Modesty is such a huge subject, and especially the interpretation of passages such as I Timothy 2:9 that I needed to write an entire separate post on the topic. You can find it here at What does Modesty mean in I Timothy 2:9.
In summary though, dressing modestly Biblically speaking does not specifically mean “not dressing in a sexual way”. It means to dress appropriately for the occasion. So while it may be perfectly acceptable for you to wear a bikini to the beach, it would not be appropriate for you to wear a bikini to a job (unless you are a life guard or a model) or to a church service.