Young padwah seeking bra sizing wisdom!
Having recently lost a little weight (9.6kg!) I need new bras, mine are a bit saggy in the cup - nice look! 
I measured up and did boob or bust which came out as 30G
based on 30" tight, 32" snug, 37" standing bust, 39" leant over.
So that's... crazy, but ok fine. BUT my current bra is a 36C and when worn on loosest hook is fine except for slightly baggy cups - surely I can't be a G cup? And for interest I measured my current bra end to end and it's only about 30" long - but it's a 36" band??
What is going on? I HATE bra shopping at the best of times and now I've no idea what to even try with!