Knee length black dress

[TheBrockmans]

Dd needs a knee length smart black dress for a school choir. It must be knee length and plain black. Her usual style if she wears a dress is skater style, long sleeves and wouldn't want to risk showing cleavage, something coming undone etc. Something like this would be ideal if the skirt was longer. She is size 8 approx 5ft 4in. Any ideas?

I got one like that from H&M last year so you could try their Basics range...black jersey, round neck, knee length, skater style.

This one?

Try Sainsbury's, I got a knee length black dress for work with half sleeves and boat neck line recently.

Lots in h and m
m2.hm.com/m/en_gb/productpage.0807922001.html

The esprit one looks ideal as long as it would be long enough. I imagine they mean on or below the knee. One or two look ok in h&m she would want a plain neckline though. Unfortunately nearest substantial shopping centres are an hour away so would ideally like online.