It can be done in either, but I did it in Designer because to me it's easier. I have Designer set up for vector work and have tools handy for the stroke, styles etc.
I just used the pen tool and drew inside the T and changed it to the Dash Line Style stroke. You can change the size of the stitches with the numbers at the bottom. You could also duplicate the letter, remove the fill color and change the outline, Convert to curves and then adjust the nodes for your shape. I hope this helps.