I dunno, it all depends on how you feel comfortable looking. I put on about 10lbs this past year but I feel better about myself now. I have curves now, and am no longer underweight so I'm healthier. Other people are overweight and would feel better about themselves if they lost 10lbs cause that way they would look how they prefer to look and would be healthy. Everything is situational.
I do thing everyone should dress for their body type though, and no matter what size you are, thongs belong in your pants and not peeking out.
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