Questions like that are what this forum is for
No, those won't mix because a tee shirt is stretchy whereas the dress you are looking at is not (actually, it might sort of be because it looks like it's cut on the bias*, which is a whole different ball of wax).
IMO, in order to get the look you want, you will need to construct something requiring a zipper or other closures.
A few things to keep in mind:
-fewer pattern pieces don't necessarily mean easier construction.
- if you want something fitted, and are not using a stretch material, it is going to
have a lot of pieces
- trying it out in trash fabric first is always worthwhile