Lingerie for valentines

I want to wear something sexy for my fiancé for Valentine’s Day. I gained weight after having our son and I don’t let him see me as much anymore and I know it bothers him. So I really want to wear something sexy for him but I’ve never bought lingerie before let alone now that I’ve gained weight. I want something that’s is sexy but that I can feel comfortable in as well. I’m not super big but have gained a decent amount of weight. I’m 5 foot even and 160 pounds. What types of things should I look for to help disguise some of the weight??