To achieve a near perfect T-Shirt fold, I use a T-shirt folder.
Place t-shirt face first in line with the T-Shirt Folder.
Fold over right arm of the Folder over.
Pull it back, leaving the T-Shirt sleeve folded.
Repeat with the left sleeve.
Fold up the bottom of the T-Shirt Folder.
And there you have it!! A perfectly folded tshirt.