One thing I learned from internet dating: "Petite" means short. In other words, when a prospective date describes herself as petite, it is possible that she is 5'1" and weighs 185 pounds. Most men do not know this and need to know it if they are entering the world of internet dating. The consequences of not knowing can be severe.
If a woman is fairly thin to maybe a tad chubby (which doesn't bother me), say at or under 145-150 pounds depending on height, she's usually pretty honest about her weight and height.
Once you break the 150 mark...they start "adjusting" and once she hits 200 she'll usually lie through her teeth! This one girl was at LEAST 274...and her bio (which had been written only a month prior) said she was 165-which at her height of 5'10 (which turned out to be 5'8) would have been "thick" but not overly fat. This chick looked like a (slightly) less hairy Michael Moore...
Men seem to think that "petite" means slim, but women know that it's a clothing size range for short women. They have "petite" sizes up to 16. So imagine 5"2" and about 180 pounds. But there's a "P" on her shirt label.