It depends..... For slacks to be casually with say like sweaters or simply with shirts, I would say go for Flat-Fronted ones. For ones to be worn with sports coats & blazers, I would say go for single pleated ones, for blazers reverse pleats and for sports coats forward pleats. For one to worn with suits, I would say go for double pleated ones, for two piece suits reverse pleats and for three piece suits forward pleats For one to be worn with tuxedo, I would say...