At first your sissy will think that this is one subject he understands. After all, if he still secretly considers himself a male, he’ll think he knows what he likes. Disabuse him of this notion at once. Lingerie is worn by women for the purpose of sexually tempting men. Teach him to base lingerie choices on whether or not he would excite a ‘real’ man when wearing it—not whether he is ‘turned on’ by the item.
Tip: Special occasions become opportunities to build upon his growing collection of lace and silk. What color panties would the sissy like Santa to leave under the tree this Christmas?