Outfit advice

Got accepted into a one day program to help me get into medical school. I'm 20 and it didn't say a dress code so I'm assuming comfortable yet nice. I probably will wear flats and have a sweater. I tried this on today and it fits perfectly. The dress is longer on me than it is on the model. Think this is good? I felt confident in it but what to look nice since I really really want to get accepted at this school! Ps it is in the South and it's like 100 here everyday so longs pants and a shirt is kinda not smart lol