Tips for the Cloth Room:

You can make more than one Dynamic Group. By making a second one and adding the straps to it, you can give it completely different cloth parameters than the body. (If you wanted the main cloth area to be stretchy or floaty, but the straps to have different properties, you can do that!)

I like to bump up the Collision Offset to be larger than the Collision Depth. An additional 0.1 is good in this case. 

I'm going to do some sims with different cloth paramaters and post them. 

花 | 美 | 花美 | 花火 
...It's a pun.