Yes you need a clothing with morphs. Specifically PE Morphs if you want to animate the skirt or shirt lifting up.
Here is an example of a Skirt Lift:
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Here is an example of a Shirt Lift:
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At the time MG died only Smoke was doing PE Morphs with a couple items from Euphie. SO the majority of items with PE Morphs are fairly new. If you are looking any mods from
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(his updated ones), Updated Mods from
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, newer mods from
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and pretty much 90% of
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will have these PE morph options.
Some users have done this without morphs using a 3rd identical model that is invisible. Nickcockman does a good job of this in his videos but you get different success depending on the clothing item.