Small bust adjustments (SBA) in sewing seems to be not as used as full bust adjustments (judging by the amount of tutorials out there), but I found a few links that I would share! I very rarely do more than grade between a smaller and larger size for the major pattern companies, but when I decided to sew up Collete's Sorbetto top, drafted for a C cup, I thought it would be a good time to look into it. I didn't end up using any of the tutorials because I just decided to leave out the dart and wanted a flowy, unfitted shirt, but these would be useful for other patterns! Ideally, figured out on a muslin of your bodice.....if I ever did a muslin. Which I don't. I just can't bring myself to 1)use that much fabric, and 2) sew something twice. My loss, no doubt!
Moonbeam has a great tutorial for the slash and pivot method for patterns with waist and bust darts --->here
And she also has a great tutorial on slash and pivot for a pattern that doesn't have any darts --->here
Hungry Zombie Couture has a nice tutorial on the same method, if you like to look at various ones -->here
Here is another slash and pivot method over at Paunnet for a deer and doe pattern. This one has a slash going up to the shoulder seam and one to the front. I don't know what the difference is though? Maybe because it is a split front? Also good to note that the deer and doe pattern is also drafted for C cup --->here
Over at the Slapdash Sewist, she had an old post on various methods of SBA on just about every pattern bodice type! Especially useful for wrap dresses, which aren't really covered on other pages. Tutorial isn't as comprehensive, but it gives you a basic idea for the different bodice types, very useful! --->here
Hope these are useful to someone! The shirt I made today is super cute, went together really quickly, and was just the easy project I wanted :) I'll take pictures of it (and all my other projects) this week! I have another away job in upstate New York starting next week!