So for this project u'll need two of these over sized t-shirts.
To begin with cut off the hem on the bottom of the t-shirts.
Then cut along the line where the sleeves end to get a rectangular piece(as we'll be using only the rectangle at the bottom u can put the top part aside).
Now cut along one of the sides of the rectangle to kinda open it up (remember to do all this with both of the t-shirts).
Fold the piece in half and cut it in stripes BUT remember to leave place at the end so u can have one piece instead of many separate stripes.
Make holes on the marked spots.
Place the two pieces as it is shown and begin to put the red stripes into the blue holes and reverse. Reverse the pieces and do the same.
After doing the last step your top should look like this from a side, start tying together the stripes as it is shown on the picture and then u'll be done :) enjoy!