First go to second-hand shop and search for nice, big mens t-shirt. I was looking for somethin rock'n'roll and I found this. My boyfriend tried to steal it from me so be careful! ;)

You also need to wash it! you don't want to wear all the chemicals they use before selling it!

now take a t-shirt that fits you well and draw it around with white pencil on our new t-shirt. then make it longer so it gets a shape of time glass - I'm petite but the one I drew was almost too tight for me so be careful here! it's better to draw more, you can always sew it different way

cut it out

it's the only tricky moment - if u cut too much it'll be to small!!! co cut a bit more as in the pic

then just turn both sides over and sew it alonge the edge - try if it's ok for you - then sew it once again to secure it

Voila!

I added two long scraps of material from t-shirt to make nice heart-shaped neckline with something extra ;)