I thought I would do this brief write-up on my ride or die bra, the Comexim Basic plunge. (consequently, I just googled "ride or die bra," and it's the actual name of a product).
This was actually my first Comexim that I ordered from Comexim.pl, and I ordered this before I even tried on any from BreakoutBras.com - which I highly recommend if you don't know your comexim size.
Looking at all of the data on bratabase, and the size chart on their website, I arrived at this size, and it only took about 3 weeks to get to get shipped to me in Canada! This was back in March though. Even though my back measurement was 29", I did size up in the band to the 32 - I believe I determined this by looking at their own size chart, at 71cm it put me in the 70 band.
Some further thoughts regarding Comexim's basic (and some links). According to some bra bloggers, Comexim basic runs .5 - 1 cup small https://stackdd.com/comexim-basic-bra/, and http://catchingarrows.blogspot.com/2015/02/comexim-basic.html#more Also, according to stackdd's (the petitie collegiate?) review, the cups on the basic are shallower, compared to her other plunge bras.
Hmm, interesting. I found when I overlapped my two 70H plunges, Pearl Mint plunge and the Basic, https://www.bratabase.com/picture/dpyci/ they appeared the exact same pattern. So, I surmise the fabric of the Basic plunge is tougher/firmer, and therefore the fit is different. side note: if one wants "maximum boost" I say go for the Comexim basics! either the plunge or the 3-part half cup (3HC) basic, as I believe it is the strongest material, and thus you will get "max boost" of your breasts.
Lastly, I noticed that some people think that it's not a good enough t-shirt bra, and I'm honestly kind of confused, see pic here https://www.bratabase.com/picture/dm2cp/ Okay, the bratabase logo is right over where the seams are, but you honestly can hardly see the faintest of seams.
I think the band is extra firm on Comexim basic, I definitely need a 70 band is the basic plunge, but I was okay with a 65 band in a more silky fabric, like the Comexim Jasmine.
Updated on Jul 07, 2021