In general - Jordan is primarily a Muslim Country with a predominantly conservative population
who are relatively open and tolerant of other's cultures and traditions. The freedom of all religions is a protected right.
You may observe muslim ladies dressed in their traditional and religiously obligatory dress which covers the head and arms - down to their feet. Obviously western women are not subject to these customs and do not have to abide by such a dress code.
However, revealing clothing is always inappropriate. Conservative dress for both male and females is generally advisable if you want to be on the safe side.. Especially areas like where the hotel is situated (Downtown Amman) and some cities like Karak, Jerash, Salt. Shorts, mini skirts, boob tubes, low cuts etc would be very out of place in these areas and you would feel very uncomfortable as such - its not that anyone would say anything - it would attract unwelcomed stares. For men - short to the knee or below are fine.... Ladies - calf length Bermuda type pants are fine. Jeans and T shirts are absolutely fine for both.
At resort hotels in the Dead Sea and Tala Bay for example - the dress code is more relaxed - as are some areas of West Amman.
Topless sunbathing is prohibited and one-piece swimsuits are preferred, although two-piece swimsuits are acceptable at hotel pools.