The most difficult thing about making a bra that fits is that you can't determine what adjustments that you need to make until the bra is very nearly complete. Using Water soluble thread in your bobbin, you can determine where you want to be able to remove an item, sew with those parts with the water soluble thread and then dab the seams that you want to remove, allowing you to make changes and try again. This is an amazing product where you're refining that fit!
200 yard spool