You are right. It's often very vague until someone does a nice review on a product. Heck, sometimes the product description is downright off! I mean I've gotten a dress that was totally diff than what was labeled. But, there are some cases where you don't have to totally be in the dark. You can sometimes see a size chart for the product, and while it's not always 100% correct, it's very helpful. Hang on, I'll see if the Tutu you're talking about has a size chart available for the "one size"...

okay, I see it's by Leg Avenue -- which has been a fabulous lingerie brand for ever bustier I've bought, if that's any help. I would think the Tutu would be at least decent, and it's elastic, so surely it'll be stretchy.

However, it does seem to be missing a size chart. But, for Leg Avenue, this is usually how One size fits most goes:

One size: 6-11 cup: A-C Bust: 32-28 Waist: 23-29 Hip: 34-40

I agree, those are very vague since there's a huge diff in a size 6 and 11, but usually I try and go up a size if I'm anywhere near the larger end of the scale on the chart.

So as long as you fit those measurements (give or take) I'd say it'd be okay.

But, I do agree. A big lack in the info dept!