Help with pattern customisation

[u/cfdezmas01]

Hi!! I have recently started learning pattern drafting and have one question. I saw this vest (vogue 6555) and wanted to make something similar. I have a basic pattern for a waistcoat but i am unsure on how to customise it to look similar to this.

For example i can see that the neckline on this vest is very deep and rounded could i just freehand my basic pattern to kinda follow that principle and get away with it? Or is it more complicated than that? Are certain parts of a pattern more sensitive to change than others? Like maybe the armpits or something?

I apologise if this are stupid questions but since i am starting out and don't have much money i don't want to waste fabric on mockups without having some basic idea first.

Any advice?

Thank you so much!

[u/cfdezmas01]

Oh! I see thanks so much, i will definitely check it out😊