I can't think of a good flawless way for you to know, especially with the way different brands are sized. In more normal times, I would say please go for a fitting if you've had a size change and try on those you are interested in. I'm not sure I'd want to be in a fitting room just now, that's a little bit closer than I've been putting myself other than to medical professionals ;0)

In most but not all brands that Nordstrom stocks, I am one band size larger, one cup size smaller than the Spanx brand I also like....have to remember to adjust my sizing if ordering those online.

Congrats on the weight loss...I'm going to assume that was intentional!

Please go to get professionally fitted. I just went through this. It gives you at least a starting point. Although I am told I should go 34 band and I use 36. My cup size doubled. I am drooping.

I am at my smallest weight and a 4 petite. The only reason small clothes fit is because my frame is narrow.

After getting fitted, I left with one bra that I wasn’t that happy with. But....it gave me a jumping off point.

I ordered tons from Bare Neccessities. I finally found a Wacoal, which I had been wearing but in a different style.

Be prepared to put in time.

There is a formula of bands to cups, up and down, and there will be someone here who might better explain it.

I just think easier to get help first.

Good luck. Bra shopping, bathing suit shopping and jean shopping are the hardest.

No advice, but congrats on the weight loss!

Annie D knows a lot about this topic too.

Wacoal's website has a really good fitting section.

Congratulations on your weight loss - reward yourself by getting professionally fitted because not just your size but your shape has likely changed as well. A good bra fitter can usually come up with very close to the right size just by looking at you - after that, you'll know what a properly fitting bra should feel like, and you'll have a starting place for the right size. Sizes of bras, just like all women's clothes, are very inconsistent, so a properly fitting bra from one brand or in one style will be different than a properly fitting bra in another brand or style.

That bra fitting changed my relationship with bras, for the better.

Yep. Get measured and even when you have a size, still try them on. The style is important as well as the theoretical size.

Congratulations! I envy you.

When you can, get fitted. I've found that even trying on the same size and the same brand, they will still fit different. Bra shopping is awful.

One brand will fit differently than another brand in the same size. The only way to get a bra that you like is to physically go to the store and try them on. Then at a later date you will go back to purchase some more and the style will be discontinued. Ugh. Never fails and you have to start all over again.

Thanks everyone for the replies. Unfortunately there are no professional fitters close by. I live in a small town rural area. I would have to drive 50+ miles both ways to get to a bigger city. And the last time I looked, even big dept stores didn't carry very large sizes that I need.

Thanks also for the congratulations. It was a combination of eating healthier, cutting out chips and other bad snacks, and smaller portions.

If you're going to order them on the internet, the world is your oyster. In my opinion, some brands are better for large sizes than others - Prima Donna (my favourite), Elomi, and Wacoal are some.

https://www.forbes.com/sites/amyfeldman/2018/05/31/how-i-made-it-trusst-founder-sophia-berman-designing-bras-like-bridges-women-entrepreneurs-industrial-design/?sh=160dbe166846

I think if you google this shop TRUSST--they can help you. I found the visiting Pittsburgh once and purchased some well fitting bras.

I know a lot of people here really like wacoal, but they don't work for me...every one I've tried on doesn't give me sufficient support through the straps and I very uncomfortably bounce when I wallk. Being well endowed, as am I, you may have the same issue with them.

And congrats on the weight loss! Not easy to do!

My bras last longer if I buy them to fit using the least constricting set of hooks. After a few months, the bras have lost some elasticity and fit on the middle set. If they last longer than that, there's still some wear left using the tightest set of hooks. When I've tried an expansion patch, I've found that expanding by more than one row throws off the overall fit too much (gaps under the arms, etc.) I'm all front and narrow back; 34 C today at 104 lbs. but 36 DD at 140 lbs. 25 years ago.

I soak four or five bras at a time in Woolite and cool water, rinse, and let them drip dry overnight.

In my experiencereinventing, Wacol worked up to a D cup then their sizing gets weird.