>>40125897
Show more skin with high shorts, wear strappy tanktops instead of shirts, emphasize the waist, create a skirt like effect with tying a long sleeve around your waist, use fem coded unisex clothing like baggy cardigans or sleeveless sweaters and turtlenecks, leave your button ups unbuttoned some at the top with no under layer. A tight bottom layer paired with a baggy second layer is a great way to show off how lithe you are, which is feminine. There's a lot of hints you could take from women's fashion you just have to pay attention, like functionally what is the difference between pic related skirt if it was swapped for a similar fitting and cut pair of cute short shorts?
Good luck my femboy brother, your big sis loves ya.