When I was taking department course, I was required take two classes together.
It was Fashion Design 1, Construction 1.
From Design class we learn about fashion design, but not just whatever design.
You find your concept and develop designs out of it. Than also you show your patter how you would make it. Because if the garment is not able to make, than there is no use.
So when you design it, you have to think about how you will construct it.

So as part of exercise, we do de-construct, and re-construct.

this is example of de-construct and than re- construct. I cut along most of seem lines than I put back together. this was men's suit. Than I put it back as a dress.

Also from design class, I did drapes as an example of my dress.
some times it look different from drawing...

I made accessory part of my design.

sometimes these are fun. but sometimes it is hard. because fabric works different depends on what kind, and it might not turn out the way you want. but every thing is experience. TRY IT! than you will know!~!!!