OK...

Lets look at the beginning... What do you want to achieve with the girl model. How will it be animated? Do you want to show leg movement under the skirt/dress?

TBH, I would not use weights on anything that is supposed to resemble clothing, make the geometry into clothing. Use Maya Cloth or Maya nCloth. Ensure you get the settings just right and make the girl a collision object for the cloth, once thats done you get get the cloth to settle and the set its initial state to what you need, start your animation (turn off the cloth object to make the animating easier and then enable it again and run a playblast to make sure you are getting the results you need.

to make a poly object behave like cloth by painting weights onto it is time consuming and requires it to have a high poly count. Maya Cloth and nCloth were developed to make sure animators and fx artists didnt have to go through those problems.

Also it will look better in the long run.