Sweetheart A Line Blue Prom Dress Strapless Tiered Corset Long Evening Dress Yellowstone National Park: The Complete Guide for 2023 (with Map and. Elevate your special evening with this stunning blue prom dress. The sweetheart neckline and strapless design beautifully frame your shoulders, while the tiered A line silhouette creates a graceful, flowing effect. The corset structure provides both support and a flattering fit, making this long evening dress perfect for creating unforgettable memories at any formal occasion.