Using MIDUS data, I regressed waist-to-hip ratio (WHR) onto race/ethnicity and body mass index (BMI). (I figured fatter people have higher WHRs.) Here are the results for 1,974 women:
Standardized OLS regression coefficients
*statistically significant relationship with WHR
Fatter women do indeed have fatter waists compared to hips. The three minority groups are all being compared with non-Hispanic whites. Latino women have higher WHRs than their white counterparts. The other two racial groups do not differ from whites.
Consistent with my casual observations, Hispanic women are less curvy. Waist size is more similar to hip size. The curvaceous woman is more of a white thing.