I wanted to let people who are making clothing know about one of the new things in the update (1.0g).
There's a new tag you can use in the outfit XML file to tell the sim whether to let boobs bounce or not when that item of clothing is on. When the top is taken off the boobs will bounce free and again when it's put on they will stop bouncing so much. It's good for bras, straps, etc. and will hold the boobs relatively still while the top is on.
To use the tag, just put the following somewhere in your outfit's info xml file, perhaps under the Shader tag:
<BoobHolder>1</BoobHolder>
If it's set to 0 or not there at all, the boobs will bounce as usual. Setting it to 1 tells the sim not to bounce them. If you want the boobs to bounce in your outfit, then obviously this tag is useless, but for some outfits it can come in handy.