Hurray for the weight loss! Way to go - it's definitely time to get some new clothes to celebrate.
I was surprised that only one other poster mentioned Coldwater Creek. I'm a pooh-sized gal these days so I haven't shopped there in awhile but I did so dearly love their outfits. They're stylish but without looking too teeny-bopper or too mature. Warning: their items can be a little on the spendy side without coupons / discount codes, but do check their "outlet" section of the website - you'll find some great deals. Here's the apparel section:
http://www.coldwatercreek.com/outlet-apparel.aspx?ProductsPerPage=0