How many pcs?
If cotton, or maybe even if not, we would discharge both colors.
Plastisol would be 150/48 underbase, one hit. 225/40 or 180/48 for both highlight white and red, depending on what those tanks are made of.
If it was a short run we would print flash print the white and use it as a top color and the red ub.
fwiw, our plastisol prints are softer out of the dryer than wb/discharge. Even heavy deposits feel soft, rubbery, not so much ' plasticy'.