The woman on the left is wearing a long, strapless royal blue dress with a sweetheart neckline, complemented by a bold gold necklace, matching earrings, and a bracelet.
If you want a more polished or fashion-focused version:
“The woman on the left wears a floor-length, strapless royal blue gown with a sweetheart neckline, accented by statement gold jewelry including a necklace, earrings, and bracelet.”
Or a more concise caption:
“Left: woman in a strapless royal blue gown with gold jewelry.”