Oklahoma State women’s golf is set to open postseason play on Thursday, aiming for back-to-back conference titles at the Big 12 Championship at The Clubs at Houston Oaks.The Cowgirls look to defend their title and build upon its league-best 11 Big 12 Championships, four more than second-place Texas, as it faces the newly expanded 13-team field. Oklahoma State posted its seventh sweep in the Big…