Sizing for lace garments is very fluid, and can be changed to suit at the blocking stage, keeping in mind that blocking will add more length than width. Size can also be changed as described in the knit-to-fit instructions below. If you knit-to-fit, simply increase or decrease your yarn requirements, according to the percentage you adjust the finished bust. e.g. if you were to make the bust 46" wide, rather than 42", you would calculate that 46" is 10% wider than 42" (46 divided by 42 = 1.1), so you would need 10% more yarn – i.e. 12 balls rather than 11.