You can actually do this in **Illustrator** (as per request). The trick is to make sure that once you use mesh tool you drag the along handles back to 1/3 of the way along the edge otherwise it squeezes the image along.

![scrunch][1]

**Image 2**: Getting a even distort along when the shape gets shorter

In addition it can help to keep rotating the are back and forth, for easier selection.

![scrumple][2]

**Image 2**: doing the scruple

Tough there are better tools for this, it can be nice t know this for other purposes that may arise.

**Alternatives**

It is actually sufficient to just scale along the selection line once rotated so skew and scale can be enough if you dont want to use envelopes that granted can be a bit tricky. Envelopes make the edges of creases nicer tough. 

![sharp][3]

**Image 3**: You can cut the shapes (they don't have to be dots) for sharp creases. And shade the areas further enhancing the look (perhaps slightly exaggerated effect).

  [1]: https://i.sstatic.net/g7XeL.png
  [2]: https://i.sstatic.net/PwNcn.gif
  [3]: https://i.sstatic.net/v35BG.png