It sounds like you are describing a specific style of prom dress. A strapless long fitted prom gown with a sequin bodice and a side high slit would typically feature a form-fitting silhouette that hugs the curves of the body, along with a bodice that is adorned with sequins or other embellishments for added sparkle and glamour. The strapless neckline creates a sleek, modern look, while the high slit on the side of the dress adds a touch of sexiness and allows for ease of movement. This type of dress would be a great choice for a prom or formal event where you want to make a statement and show off your figure. This kind of dress would be fantastic for a prom or formal event where you want to make a statement and show off your body.