Traditionally, there are halachic rules and community customs that lead to a particular pattern of dress for those that observe the halacha regarding modesty. This is most typical among the Orthodox segment of Judaism, but is occasionally found elsewhere. It is good to keep these rules in mind if you visit traditional communities, especially in Israel. The neckline does not expose any cleavage.
Skirts are long enough to cover the knee when seated.
Women not in such situations at all are encouraged not to wear pants. Married women cover their hair either completely, or with approximately 2 finger widths showing of the bangs. The FAQ is a collection of documents that is an attempt to answer questions that are continually asked on the soc.culture.jewish family of newsgroups. It was written by cooperating laypeople from the various Judaic movements. Hopefully, the FAQ will provide the answer to your questions.