Im 172 cm and I look best at 60kg which gets me into a size 10 easily without anything hanging out. My lowest weight was 54kg and I had people freaking out that I had an eating disorder. Which I didn't. I look back on photos now and I can see that it didnt look good on me. I was a size 8 at 54kg.
I was also 75kg and a size 12-14 and I looked horrid. Never again.
Just depends on your bone structure and how/where you gain weight.
If I gained weight and had a nice chunky butt it would be all good. Instead I just end up looking pregnant.