Under $100 Look : Purple Strapless Dress
The cropped tab jacket is optional but it’s a nice cover up at night or a day wedding. Take it off once you’ve had a couple drink, hehe. 
Purple strapless dress, $19.80
Black Cadette Tab Jacket, $21.50
Black Peep-Toe Pumps, $17.99
A deep purple or black clutch would look nice with this ensemble too
(Image : Forever21, WetSeal, UrbanOG)
I like this look, this can very easily go from day to night look.