Get rid of it and start a new life.
Trust me, it feels good afterwards
And - you can absolutely get new pretty things right now! Tons of places where you can get cheap "in between" clothes that look nice. Ross, Target, H&M, Forever 21, etc. For sure, it doesn't make sense to get a ton of variety but you really should get nice things for yourself to celebrate your successes!
The most fun part is... buying nice things somewhat too small... and then working on fitting into them... and not fitting anymore when the same things become too huge. An awesome feeling!