Plus, I can say as a person trained in marketing, it's not really useful. Marketers need your input, especially for things that are so hard to collect data on. You can make requests to companies, and if they find there's a high enough need, they just might take you up on your offer.  Companies don't know what they don't know, and the problem with using past, typical purchasing behavior to figure out more common sizes can be misleading because if someone falls outside of that size, of course your data won't show that it's in high demand. This is especially a problem with bras, since most women don't wear the correct size. About a year ago I wrote a (polite) letter to Victoria's Secret explaining that there definitely is (and always has been) a need for bands 26-30 (especially 28), and for cup sizes beyond a simple A, B, C, and MAYBE D, especially since our demographic are changing, and the increase in population is is made up primarily of people smaller in stature, and let's not forget that our sizes would have a higher profit margin.  The response I got back seemed genuinely interested, and I was told that the idea would be run past the marketing team. Kind of a cliche response, I know, but they definitely have expanded the lower size bands and band/cup combo, so it seems like they're steadily adding more and more of these options to test the waters. I'm not sure if t was my letter, or a lot of people's letters, but it has to start somewhere. tldr: Assuming you're not a special sneauxfleighk that they can't make money off of, bitching in a "letter to" a company on Tumblr is not going to get you what you want.