I saw somewhere that someone said to cut the Frogg Toggs. I can’t remember if they said horizontally or vertically.
I believe how you want to cut them is up to what size you want. I do not think it matters either way. I don’t remember which way I cut mine, but I made it into three pieces.
I believe that most people cut them lengthwise, but functionally it really doesn’t matter so cut them as you see fit.