I'm not aware of anything hexagon specific. 
Here's an example of how it's done in Lightwave. Commands and tools may be called something slightly different, but general approach is about the same.
http://newtek.com/products/lightwave/tutorials/modeling/clothing-details/index.html

If you want something simpler, you could start with an irregular zigzag going around the waist, then extrude it to get some height...

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