Lingerie

So! I'm planning on spicing up my sex life with my boyfriend. Weve been together about 3 years; and when we have sex i just wear the same old bras, pants etc. I want to get some decent lingerie to wear under my clothes to wow him after our next date night. Best type of lingerie for wearing under clothes?? (Preferably something a bit more spontaneous than a matching bra and panty set?) Thank you!!