One beer box or similar in size cardboard box
Deconstruct box. Take the top and bottom tabs of the box apart. Lay flat.
Cut along the top end.
Cut the bottom end of the box along seam.
Discard one side.
Leave gap between flaps. About 1/4inch. I just used the natural gap of the box.
Duck tape the two flaps, with gap left between.
Duck tape the other side of the box and join the tape together between the gap.
Press the tape together. Should look like this.
One side done.
Repeat steps 5-7 one the other side.
Box construction finished.
GO GRAB A SHIRT!
Face shirt flat face down.
Fold one side over quickly.
More flap back.
Fold over the other side quickly.
Place left hand or the side your sleeves are on and fold it over quickly.
And you have a perfectly folded shirt even your mom would be proud of.
It also works with sweatshirts.