...too small

The fabric is absolutely gorgeous - navy herringbone with a subtle sheen. The shape and detailing on the jacket is beautiful. Here's the original link http://youlookfab.com/welookfa.....uit-for-me

But I can't quite get the pants done up and although the jacket buttons, it's snug. I would say it's one size too small.

So here's the question: it "just about" fits and I have committed to a new health and fitness regime after the holidays and I do love this suit. Do I keep it as incentive to fit in about 10 pounds from now? or do I just ship it back to Nordstrom, losing a chunk of change due to return shipping costs and loss of duty and call it a day?