Looking for a prom dress again

Well my daughter went to her first prom last year with her boyfriend.  He was a senior and she was in the 10th grade.  She was so excited.  She wanted an old fashion type of dress one that was like a princess dress.  We purchased it used for $250 and had some alterations done on it.  It was sooo pretty.

This year she's a junior and at her school they have a junior/senior prom.  She told me she wants to go "all out" next year for her senior prom so we've decided to purchase used again.  I'm signed up on Facebook to a lot of the yard sale type of groups and have found lots of good deals.  We are going Friday to try on a dress that if it fits right we will get for her.  If you are conservative with money like I am (being a single mom) then this is definitely the way to go :)... I donated the prom dress from last year to Goodwill and held it off on my taxes as a deductible.  I'll post some pictures of it below.