For now, our code is 7 lines long, and counting. Your pattern draft might be several dozens of lines long, and it is good to know how to make the process of reading, understanding and editing it less complicated. 

Here are a couple of ideas:

This might make your code longer, but it is easier to read. While you are creating your pattern you have a clear picture of what you are doing and may cut corners. However when you return to it weeks or months later, you might forget why you placed P110 by (sz43-sz40)+1*0.5-[p120:p130].l to the right from P1.

You can then edit them in one highly visible place, and the rest of the geometry will be executed accordingly.

Comments are like sticky notes on your drafting. You can leave yourself, or your colleague a note explaining why you did it a certain way, or simply mark up the sections of your draft. To mark one line, or a part of a line, use //. To comment on several lines, use /* at the beginning and */ at the end.

It's ok to press the return button for another paragraph. It doesn't affect the way your draft is processed by the system, and it makes it easier to read.

Let's take a look at the skirt pattern draft and make some changes to it. 

Sewist doesn't limit you in terms of pattern drafting methods, and you can use whatever system you prefer, or even experiment with your own one. For the sake of this manual we are going to make it rather simple, and rely on anthropometry only when we calculate the most vital variables. It is our design decision, that there will be one dart in the front, and one in the back, and we shall distribute these proportionally.

// Settings

ea19 = 1.5 // ease allowance around hips

ea18 = 0.5 // ease allowance around waist

back_dart_pos = 0.55 // that's how far the back dart is placed on back skirt from back center

front_dart_pos = 0.5  // that's how far the front dart is placed on front skirt front center

// Calculations

hip_width = sz19/2 + ea19 // width of skirt pattern at the hip level

waist_width = sz18/2 + ea18  // width of skirt pattern at the waist level

skirt_length = sz26 - sz9 // knee length

dif_side = sz25 - sz26 // how much higher the top corner of side seam is from height of center front

hip_length = ( sz7 - sz12 ) * 0.76 // length from waist to hips

back_dart_length = hip_length * 0.7 // length of back dart

front_dart_length = hip_length * 0.45 // length of front dart

back_dart = dif_waist_hip * 0.35 // width of the back dart

front_dart = dif_waist_hip * 0.15 // width of the front dart

side_dart = dif_waist_hip * 0.5 // width of the side dart

We can now continue with drafting. Later, if we decide to change ease allowances, or re-distribute darts, we can easily do it in the beginning of the pattern draft.