Grab your material and line the lower part of the dress... i went square because i wonted a pencil dress :) ... cut two 5cm wide bands of black material and attach them to bout sides of the dress... in my case this was a little bit stretchy material because the plaid one is to firm... after that sew it all together like a skirt

Make the back side of bodice from black material ... attach to it smaller front size peaces of plaid material .. like on the pic.... add 3 stripes between plaid material and sew it all together

It is turn to make the sleeves... trace along some sleeve that you already have on some dress or smtn :) cut the fabric and add little black bands at the part that goes close to your hands... after that... sew them to the bodice from inside out :)

I forgot to make a pic. of this step so i improvised with 2 pictures :) ... but you just have to attach bodice to the skirt part and sew them together...at the end you can add a belt like I did but its your choice ... :)