I am often asked about the process I use to illustrate on the iPad. I use an application called Adobe Ideas, which has since evolved into something called Adobe Draw (which I refuse to upgrade to because they screwed up the Undo tool big-time).
I usually start with a rough sketch by hand, which I then photograph and trace over on the iPad. I use a fancy electronic pen from Paper 53 that allows me to get the line quality with the drawing tools that is almost like drawing on real paper.
After tracing the underlying croquis from my hand-sketch, I start to fill in the outline of the garment:
Next comes the coloration, usually on a separate layer (layers are the reason why the Adobe technology is so genius) so I have some flexibility and can erase mistakes easily without hurting the croquis.
And finally, I add some shading and my signature et voilà , I have a finished Illustration ready to post! Between my iPad and Instagram, I am able to draw in my more classic, lady-like style while exploiting the immediacy of modern technology. Cool!