Thanks to Frilly Fusion for all this great info!!

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I just thought some of this information might be helpful.

Bra Fit Resources

Bra Calculators  are meant to give you a good starting point, you should still try on different band and cups to see what works best.  These are the two most accurate I could find.

http://www.sophisticatedpair.com/bracalculator.htm 

http://www.butterflycollection.ca/bra-size-calculator/

On Sizing

How to Find your Bra Size

What do sizes really look like?

What does it mean to wear D cups?

G cups

Bra Size Catalogue

Blogs with good information:

VenusianGlow.com  All kinds of fitting information. Links to befores and afters.

BrasIhate I’ve linked to her helpful alteration tips.

Butterfly Collection also has an online story for D-K cup sizes.

Invest in Your Chest Bra reviews, will show upcoming styles

Braless in Brazil

Thin and Curvy

Boosaurus

BustyResources Wiki with source blogs list

Bratabase  A database of bras, reviews, and bra measurements so you can determine what size you might want to buy online.  Record how your own bra fits and get suggestions from other users. 

A Bra That Fits on Reddit 

Small boobs: 

Another Video

32aabra (blog)

Small Bust Big Heart (blog)

When adding inches helps: 

Bra Fitting Formulas Is the War on Plus Four the Answer?

The Women who Need to Add Inches

Small Band Project:

Bras for sub-28 ribcage, do you need 26?

Band Alteration: 

Bra Alteration Tightening 30gg Deco

Shrinking A Bra Band

Bra Band Alteration Tutorial

Brands for Full Bust / Plus Size

10 Best Brands for Full Cup/Plus Size

8 Bra Choices for Plus Size/Full Bust Women/40-50 band

Sister Sizing

Cup size is determined by the band.  A 36C will have a bigger cup than a 34C.   34C and 36 B will have the same cup volume.  

Go across the rows for the same cup volume on a different band

Unfortunately I can’t find a link to an easy guide to how sizing differs between US/UK/Europe/Aus because the systems are such a mess.  If anyone has any accurate recommendations, please link and I’ll add.

Where to buy (in progress)

And yes, uncommon bra sizes will cost more, but if you’re savvy you can find them on sale.  They’ll earn their value in comfort, looks and longevity.  

Online:

BraStop

Butterfly Collection

Figleaves

Bravissimo

ASOS

HerRoom

Bare Necessities

A Sophisticated Pair

Once you’re pretty sure of your bra size in a certain brand check ebay for some really good deals.

Bra Swap on Reddit

In Stores:

Nordstrom’s and Nordstom’s Rack

Macy’s carries Wacoal up to G, don’t expect much selection

Recommendations?

Bra Donation

http://www.freethegirls.com/donate/

http://brarecycling.com/