We all know weight is extremely important in SMV/RMV, but I have a personal anecdote that showcases exactly how important it is.
Me and a few colleagues are at a conference (two of them are male, a few years older than me, but we are all friends and one of them is married and the other has a girlfriend).
Anyways, we are people watching, also meeting some new people for networking.
Later we are having dinner all together, and the guys start talking about the people we met earlier that day. And when they came to the women, they essentially categorized the women in the following:
"Nice" was really only described for the women who were much older (AKA the men didn't even really notice an impression) or were simply kind of plain (normal weight but nothing stood out about her in her clothes or appearance). Otherwise they described women as "cute" or "fat."
This is how men's brains work at the basic level. Nothing about "oh she seems interesting" "she seems nice to talk to."
Of course in terms of RMV qualities, you should be pleasant company and have something going on for yourself for long term attraction, but note that on the BASIC level of attraction, just to get your foot in the door and have a guy be even remotely interested, it's all about the physical appearance (weight, clothes, makeup/hair).