Treating vaginal candida albicans. what type of soap should be used down there? should i stop wearing underwear? best safe practices?

Vaginal yeast: Vaginal yeast infection, usually caused by Candida albicans, is not sexually transmitted and there are no "safe practices" to worry about. And yeast because of tight clothing is an urban myth; underwear won't make a difference and neither will the soap you use. Make sure diagnosis is correct, get the right treatment (usually an "azole" medication), and otherwise don't worry about it.