DUI makes dry suits for warm water diving. It's all about the insullation if you have a shell type suit. So you just thin down what's underneath for teh water temperature. You can still get cold in the (realitively warm) Hawiian water.
Normal body temperature - 98.6 degrees
What we call "warm" water temperature - 75 degrees?
difference: 23.6 degrees
Prolonged exposure of a long, or a number of sequential dives - you will suffer the effects of lowing your body core temperature. Nothing wrong with diving a DS in that environment.