Usually shoulder width is more related to upper bust measurement rather than full bust measurement, but everyone’s body is unique! Does this description of the Liesl+Co sizing help? https://oliverands.com/community/blog/2013/11/finding-your-correct-pattern-size.html
There is a shelf lining pattern piece included for pattern cup size D (not to be confused with bra cup size D). The gathered bodice appears to work for all the included cup sizes (A/B, C and D). Size 10D generally would be for someone with an upper bust measurement of 37 1/2 inches and a full bust measurement of 41 1/2 inches (4 inch difference). If your full bust measurement is 44 inches, then you would probably want a FBA for at least the lining. You could measure the bodice pattern piece to see if the included gathering would give you enough ease, but making a muslin would confirm it.