Garment measurements are included in the instructions of each sewing pattern.
All of our patterns are drafted with a B cup and drafted for 168cm (5′ 6″)
(that’s a 5cm/2″ difference between your high bust and full bust – not your RTW bra cup size)
I always recommend making a toile for a new pattern. A toile is just a quick mock-up of your pattern in calico or random unloved old fabric to check the fit for you before you cut into your lovely fabric. There is no need to neaten the seams, add fastenings or details such as collars or pockets (although they can be useful!).