Reddit mentions of Natori Women's Feathers Plunge Contour Bra, Cafe, 32DDD

>but I don't even fill the cups.

Look up orange-in-a-glass effect.

If the bra is too small in the cup and or too projected and not shallow and wide enough in the cup, the cup will sit on top of your breasts like a too small party hat.

The cup will be empty and many people with small breasts think it is too large, when it is actually too small.

>With my forms, I wear a Wonder Bra 7409 in 38DD, which seems pretty good in the band, but the cups are far too big for my natural tissue.

This is probably because the cups of the Wonderbra are projected. You most likely need something shallower, like the Natori Feathers in 38 C/D or so.

https://www.amazon.com/Natori-Womens-Feathers-Contour-Plunge/dp/B007DKZCS0/

I'm not a lifter, but if the bottom of your cup folds that's a good sign of a bad fit. Your band also looks strained, which - since your underbust measurements are 33/31 and you're wearing a 34 - indicates your cup is probably too small. 34E may be too big, but I'd start with 34DD to get a better idea of how your muscle tissue comes into play.

There's some really lovely sports bras that can pull double duty if you want to stay wireless. Chantelle, Panache and Shock Absorber are three great options. If you're willing to try wired, Natori Feathers and/or Wacoal Embrace Lace are good picks. They both have stretchy bands (for comfort) and medium wires (for your lats) - also, Feathers is a shallow shape test bra. If you just want comfort and coverage, Aerie's bralettes are pretty popular.

And I'm one of those non-static people who switches bra sizes/shapes once a month. We exist!