She's not fat, but she's not athletic either, especially compared to Zara or Bella, or better yet, compare her to Louise, the girl who was in the night street basketball game at the end of Chapter 5. Louise is also petite, but very fit.
The only scene where we see Vic completely naked, which crosses my mind - are those special renders with a collar and a condom. And there she has a sexy tummy, which Fabienne talked about to Butch in Pulp Fiction.
I don't know how, but Ocean managed to make half of the renders with Vic absolutely unattractive to me, and half where I find her very attractive and a few where she's absolutely gorgeous. Overall, she's probably the most interesting character for me in terms of the plot, because it's unclear what her future role is in this whole story, and how she is/was connected to the MC (something in the past?). But she appears in almost all the events, one way or another. She's always somewhere nearby.