as other people have mentioned you have 2 separate topics going here.

V4 has magnets built in, Magnetise poses simply extand the effect of the magnets to v4s clothing so that when v4 is moved and the magent activate the clothes move s well. The most visible one is the movement of the breasts with the collars raised

 

Most conforming items that do not have morphs for skirt movement may rely on bodyhandles. These are extra parts added to the skirt so you can pull it around. Check in the bodypart listing of the skirt for things like 'skirt', 'front' or  'hem' , these are probably bodyhandles.

For example my V4 Fancy dress has a total of eight handles on the skirt - left thight, right thigh, left hem, front hem, backhem, righthem, sithip and sitshin. By moving these various ahndles you can arrange the skirt over almost any pose including sitting and kneeling

it is possible to use magnets for making a skirt sit, but I'm going to warn you right off you will get some distortions.

Here is a tutorial I posted some time ago, that will walk you through the basics of udnerstanding and using magnets. Magnets are best at in and out motions and not so much at around the corner motions

http://www.sharecg.com/v/18967/View/3/Text-Entry-Tutorial/Poser-Magnet-Tutorial

Lyrra