Tighten, Smooth are the main tools that are automated in the fitting room.
Sometimes you have more control in the fitting room, sometimes you have more control with the brushes.

Mostly I use the Tighten brush at Radius 1, and Magnitude 0.2

Then PAINT the Smooth with a smaller Smooth brush to maintain the details in the mesh of the clothing
If the clothing is symmetrical you can use the mirror funtion, otherwise you have to PAINT the Smooth on both sides.

=> Tighten with the full brush at Radius 1, and Paint the Smooth with a smaller brush if the clothing has mesh details. Always use a low Magnitude and go slowly. :-)

Happy Posering

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!