Only PNM in Black Dresses Allowed

[MTSUGURL]

Are black dresses TRULY the desired and expected attire for rushees at Pref?
I know every girl looks good in black, but as someone who is trying to buy minimum amounts of clothes for recruitment, I have some perfectly cute et colorful dresses in my closet now. I know there is no "uniform" for recruitment, just guidelines, but everything I've ever seen about pref had PNMs preparing for a funeral. Are colorful outfits discouraged?

Side note - I remember feelng underdressed when I went to the pref parties at my old university. I wore a really nice semiformal, and other girls were actually in prm dresses. No way I'm dragging out the sequins...