Lady's Marron Wedding Dress Off-Shoulder

This dress is the number one best-selling item at Rakuten Ladies Marron.

I purchased it on Mercari, but the seller had altered the dress by taking in the bust under the side ribbons, making the bust size slightly smaller than stated.
I bought it intending to remove the alteration myself, but when I tried it on, the size was perfect, so I wore it as is.
Please be aware that I cannot remove the alteration.

I wore it once at an after-party for a wedding, but there is some staining on the hem.
Please understand that this is a used item that has been handled by multiple people.

For reference, I am 163cm tall and weigh 56kg.
Without heels, the hem barely touched the floor.
My upper body is "natural" and my lower body is "straight" (body shape types).