oh! I think you mean like facing/interfacing^
You just trace the edge, maybe 3-5 cm width in another fabric
and then sew it down, right sides facing together
When you flip it right side out, you'll have a clean edge;
and you can sew it again on the right side to keep it firmly in place
Thanks for the reply,
educo
It's great to finally get the pattern done
It still needs a bit of tweaking (ie. shoulder seam is a little bit closer to the back)... Almost finished
I have been increasing the width for some time now, and it's still not enough --not comfortable to wear
I was worried it would look too loose, if I added too much width. I want to keep a certain 'silhouette'
Anyway I might just add slits to the side seam from the hem and upwards so I can move comfortably in the garment but keep it 'well-fitted'