All of my patterns are graded for 9 sizes. My sizes are based on two important measurements: bust circumference & shoulder width. 

Please read the information below to choose your size correctly.

All sizes (if possible) are calculated based on these numbers:

Body bust circumference of: 75 (85, 95, 105, 115), [125, 135, 145, 155] cm / 29.5 (33.5, 37.5, 41.25, 45.25), [49.25, 53.25, 57, 61]”

Body shoulder width of: 35.5 (36.5, 38, 39, 40.5), [41.5, 43, 44, 45.5] cm / 14 (14.25, 15, 15.25, 16), [16.25, 17, 17.25, 18]”

Always try to find a size that is the closest to your actual bust and shoulder measurements. Eg., if your bust circumference is 97 cm / 38.25" – you should choose size 3. Each pattern contains detailed schematics, so you know all the measurements of a finished piece.

Another approach could be to add your intended ease to your actual bust circumference, then pick a size. Eg., you want 10 cm / 4" of positive ease – 97 + 10 / 38.25 + 4 = 107 cm / 42.25".Then you need to look at the finished garment measurements. Let's take Tsibulak Vest schematics as our example.

You want to search for a size closest to 107 cm / 42.25" – you will find that you fall directly between size 3 & 4. In such a case, it is important to have a look at your shoulder width.

Let's say your body shoulder width is 40 cm / 15.75". Garment shoulder width is 39.5 cm / 15.5" for size 3, and 40.5 cm / 16" for size 4. Garment shoulder width should NOT be bigger then your actual shoulder width. So based on your shoulder width, you should rather pick size 3, which would give you 5 cm / 2" of positive ease. To make more room for your bust, the best approach is to cast on more stitches and then work more decreases while shaping the armholes (this vest is worked bottom-up; for a top-down garment, you would make more increase rounds while shaping the armholes).

And now, most importantly, you need to know how to measure yourself.

With your shoulders relaxed, measure across your upper back from one shoulder tip to the other. The shoulder tip is the bony point where the collarbone meets the shoulder.

Please look at the following schematics for a correct body shoulder width measurement.