The blue in that dress is the colour I'm referring to. Shirts, pants, shoes/footwear, accessories, etc. It's such a gorgeous colour, but I'm having an immensely difficult time finding shoes to match. I believe the colour's name is "Colbalt blue". They don't have to be new items either. Just recolours :3

I found quite a few nice shoes that could match the dress.

You could also match the green and teal in the dress with the shoes, that may be easier.