It's been ages since I've made lingerie, but it was fun. Esp. the little half slip tops we used to wear when wearing sheer blouses and such. I once had the opportunity to take a lingerie sewing class and I've always regretted not taking it.
As to the cost of making lingerie you can buy it cheaper, but I've found that applies to anything I sew these days. Sewing on slinky material is a challenge but I think you will enjoy wearing your own creations. :roll: