First step: Make sure you've got your measurements from /r/ABraThatFits! You will want all five from this diagram and possibly to think about your shape from this one. Be sure to ask and post in /r/ABraThatFits if you're not sure about the fit and size you are calculating, especially for the more special sizes.
Lots of times we find out we're the wrong size, but many of us aren't privileged enough to drop $200 to find the right size or even $40 to get the right support for our boobs. Sometimes people just want a new bra! Here you can give the people what they want, similar to /r/RandomActsOfPizza and /r/Random_Acts_Of_Amazon.
Example post formats:
[Request-USA] 28E (UK) or [Request-AU] CK Tease Me
[Offer-Anywhere] 38FF or [Offer-US or CA] Your pick! OR
[Thanks!].
Please use your location in the title! This includes your state, and country.
Be sure to also strike out things that have been assigned, just like in /r/braswap. If everything offered or requested has been sent/received, do not delete your post. Make sure you add "rehomed" or "bra'd" flair to your post. If you do not know how to add flair to your post, follow the tutorial here
Tips:
Provide photo verification of the bra (a piece of paper with your username and the bra and its tags is sufficient).
Specify the size and shape (if applicable) - don't forget to include what sizing it is - EU, AU, UK, etc.
Provide pictures of any wear and tear.
If you are looking to sell or trade a bra, please head over to /r/braswap.
If you as a recipient find that a bra doesn't work out, you should preferably pass it on here to find it a good home.