Qatar is conservative.  It is not conservative like Saudi, but it is a million years away from being like Dubai.  Don't expect to wear tight or revealing clothes in public without consequence.  you will get a range of reactions.  men will stare at you either sexually or angrily.  local women may approach you and tell you to dress properly.  you will get many, many overt sexual advances from men.  i would advise you to leave the mini skirts at home and enjoy them where you won't have to worry about the reactions you will face.