Help with a Hooded wrap scarf pattern

[johnson1]

Hi, I hope someone can help me with some instructions I have difficulty with. I am knitting 2 rows until my work measures 19" from needle along garter st edge to point. Place marker at each end of last row. I understand measuring my work to 19", but I don't understand the rest. Do I measure like diagonally? I appreciate any help I can get. Thanks so much

[GrumpyGramma]

Can you link to your pattern or post a few rows of the instructions. That would be helpful. I think you want to measure the length of the piece you're working on.