I bought this bra in 30GG (aqua) and 32G (black), and they fit so differently they might as well be different bras. 30GG is a great fit apart from being a tiny bit too wide and some in-cup quadding. 32G is way too wide with super wide-set straps, and I can't fill out the lace portion at the top, which results in a pointy shape.
Besides apparently being a completely different cut despite being only one sister size different, there are a few differences in construction between the two as well due to the jump from G to GG. The 32G has thin straps; the 30GG has thicker straps that are padded on the front half. The 32G has one layer of thin stretch lace; the 30GG has a completely different lace reinforced with power mesh underneath.
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Updated on Feb 08, 2021 Flag this
Unfortunately I can relate, this definitely happens in Cleo / Panache (and other brands - I know I was shocked to first find out, years ago with my 30GG - Freya » Flourish Balcony Bra (1542) - apparently Freya bras go from 'airy / flimsy' to 'industrial strength' between 32G and 30GG).
I've recently re-confirmed that Panache Jasmine (in 30GG versus 32G) is like a different bra as well. But for Jasmine, like you with Hettie, I prefer the 'build' of the 30GG - with 3x hooks, sturdy straps, less wide-set overall.
The 32G Jasmine has a thin 2-hook band, feels more flimsy, thinner straps, seems to suit a much wider frame (a.k.a. not me). The gore feels different as well (weirdly it seems higher on the 32G, while the rest of that bra is way less sturdy).
Good to know though, these variations over size range, so thanks for informing us on Hettie!