Una, I can't see any lumps in the pics that are posted either. Either they're not there or else the pattern is really hiding them?
I agree with the others who say that if you're not comfortable in it, you shouldn't keep it...because you won't wear it. I wouldn't keep it as "incentive" to lose 10 pounds, because I think that would just make you feel guilty every time you saw it in your closet and couldn't wear it because you hadn't lost the 10 pounds yet. And we buy clothes to fit our bodies, right? We don't alter our bodies to fit the clothes.
Maybe post a pic of the side view if you're still unsure?