Go to The Black Cat in Gran Soren. You can find it by following the streets to the right as you enter the city. Speak to the owner and choose 'Buy'. Under Torso you can find Set of Lady's Grab available to purchase for 6,200 G. This is a full set of women's clothing. Go to your equipment and equip it to either yourself or your pawn depending on which is male. If both of you are female, go to The Rift and hire a male pawn to use as your puppet. As soon as you select the Lady's Grab to equip, the achievement will unlock.