Create DIY for this, I guessing you are going to need to use 2 shirts, cut the one you'll wear with the side slits. Then cut strips out of Tshirt, sew into the inside of the first shirt at the top then weave and sew to the bottom of shirt.
This outfit rocks for a two reasons: the taupe and gold necklace dress up the red pants. They're also great with black or white of course. Next, I'm just so happy my red pants are back in style from the last time around! (and that they fit- yay)