I'm with Mimo and Ja Kay!
1Base, 2Purple, 3Bright yellow, 4Top white. (I' with Pierre and the grey tee determining if a top white is needed. This could give it a Vegas gold tone to it...but you could also print a Vegas looking gold if the budget permitted.
Most would also opt to have a halftone pink and a solid pink, but you could pull that off with one pink, by cutting back on your darkest point of the halftone pink...and printing it with two strokes. If I don't see a black in the art, I don't use a black. Use other colors to darken a color. Looks richer.