From me as man; too slim is not attractive and definitely not sexy. Too much falls in the same category.
If talking of a little more than a rattling skeleton - most men will turn away. Very few might like it. A very skinny woman creates an mental image: Can't cook, does not like food, is very sick, is very poor, is very stressed, has lots of issues, is very negative.
A more fleshy woman creates another series of issues: doesn't care too much about herself (and then her man), does love food, can cook and is generally more friendly, honest and pleasure to be around; but cost more money.
Living in Thailand and particularly neat the famous Pattaya - World of Love; I can say this from observing thousands of European men around here; A obese lady and very skinny not liked. The skinny one even less.
As I heard visitors and customers of us often say "I love to feel the softness in the woman".
MUCH more important than the looks is the Appearance (clean, tidy) and Personality (honest, open friendly, joyful).