When you're plus size, many formal dresses for spring weddings can overwhelm you with fabric. They tend to be floor-length, and put too much emphasis on hiding your curves rather than accentuating them. This Xscape gown is a formal dress, but it reveals just enough skin so you'll still feel sexy.
If you're looking for a semi-formal dress, consider this Adrianna Papell lace knit dress. The portrait collar draws attention to your face, while the flutter sleeves keep it fun and flirty.