long black sparkly dress ASOS DESIGN all-over sequin sleeve wrap front detail maxi in Powermesh Lining Black Sequin Backless Mermaid Maxi

We have a couple great examples of this below

It is important when choosing a long sleeved style that the sleeves fit well in order not to add bulk to the style for example a bell sleeve with a mini A-line dress creates too much width across the hips

You can just make a list at what you have ( I personally use Dress to Impress), and you can add what you are looking for, and then for every person you click on you can "Compare with your items" and see what they have that you want and what they want that you have

L: bust 38 in, waist 35 in, sleeve 25 in, back length 28 in, hem width 81 in

This is fine, but even just changing up one thing will help to elevate your regular little black dress look