I wanted a metallic highlight behind each of my brocade motifs. I planned my design so that motifs fell at quarters, halves and eights. My skirt was a perfect tube before finishing, so I folded it half, marked my center points for motifs with tailors chalk, and folded it again to mark other areas. Depending on what you want you could measure for marks, fold in sixths, whatever. The important part is to plot the entire skirt before you start painting and then look it over to catch any mistakes. I had no problem painting over small chalk marks but if you're worried about it try it on a swatch or mark them some other way.