To sort of echo the posts above: Appearances and first impressions matter. Nobody will cut you BECAUSE you're overweight, but some women just won't like you as much as they might like a thinner person. It's usually very abstract and subtle. Few houses have "No fat chicks" in their needs assessment.
And, in my experience, a very well groomed, well dressed overweight girl does better than a skinny girl who hasn't taken the time to do her hair and makeup or wear flattering clothing.
That said: You should still do recruitment! Sororities want fun, involved, motivated women with good grades and activities. If you fit those criteria, you'll do well.
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