I have made t-shirt dresses before using a skirt and t-shirt and this is very similar. The only difference is that The skirt fabric is taken from a dress.
I used a very pretty silk FrostFrench dress which was great but the straps bugged me and I felt too dainty in it - just a general ‘off’ feeling but actually nothing wrong with the dress.
All you have to do is chop the t-shirt a couple of inches below the bottom of your bust.
Cut the straps off the dress and I used the neckline of the dress to attach to the cut hem of the t-shirt. I knew that by doing this the hem line of the finished dress would be wonky but i liked the idea of it not being perfect - wonky hems can be called asymmetric - See Preens amazing collections.
And - that is it! Made yesterday, worn today ❤️.