Whiy don't you use the Marie skirt form gurda patterns? It's free online (lots of links about) and extend it to meet the high waistband. then take a simple tee top and copy the shape, adding width for the pleats.then fasten the pleats at the shoulder with a few stitches.
the marie skirt has its pleats arrange differently, but you could just ignore that and use the basic shape.
Good luck! I love these styles, making my own version too
I used a simple flared-skirt dress i already had, detached the skirt form the waistband, inverted it, arrange the pleats, and sewed it back on. Instant tulip dress! And the jersey means you don't have to worry too much about the stretch around the knees.