Make a T-tunic

For more advanced instructions (it'll fit better, but take a bit longer), see: http://www.reconstructinghistory.com/beginners/StLouis.html

This adds gores and gussets to the pattern, meaning the pieces can be cut tighter around the body, but you can still move and even fight or dance in the garment.

Of course t-tunics can be as complicated as you want them to be, and can fit quite tightly. But even the more interesting t-tunics from the middle medieval period (12-14th C) are simpler to picture for people with good spatial skills than late period garb - it's still just rectangles and triangles, just more of them.

T-tunics are extremely economic on fabric usage. If you can get 150cm wide fabric, normally twice the desired length of the tunic plus half-a-metre will give you a good tunic.