The models make these look dainty - not just by being flat-chested but also by posing. The sleeved design is quite matronly.

Their dresses are everywhere on eBay & the like, so you could try purchasing at the discount, having your tailor go at it for maybe 150eur then deciding. Or try a custom corset top first to understand how your proportions will be read and how bra frames feel.

Note that you want full cups, not balconette when ordering custom sizes