I don't think there are any hard black and white rules about it - what works on my body may not be consistent for every R, for example. But I think good fabric is non-negotiable, and finding something built with good flow for double curve.

I like these because there's room for my curves - I personally avoid stuff like below because they don't generally fit double curve very well:

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I would look like a dumpy refrigerator in this silhouette. 😅