You could follow the pattern directions for the size 48"...but use a needle that will give you a bit more than 4" per 17st...like I did with the size 44".
You and I are both in between the sizes stated.
The size 48" says you'll need 1,830 yds.
The size 52" says you'll need 2,928 yds.
I don't understand the huge increase in yardage requirements from size 48" to 52".
But if you are making the size 48" using a slightly bigger gauge, I think you will have more than enough yardage with your 26 skeins of Debbie Bliss Aran Tweed (2,834 yds)!!!
I'm betting you'll have lots leftover in fact!
I love the color of your yarn! Very crisp, very unique!
Knit on Good Woman!
Remember, the measurements are the measurements for the finished garment itself...not our own bust measurement. You measure your bust, and then factor in the 'ease' or 'roominess' that you want.
Here's what I do: I take a cloth tape measure...reel out 48" (for example) and create a 48" circle around my bust with it. If it seems HUGE...I know the garment will be too big. And vice versa.