One of the big fashion trends right now is the semi-transparent/sheer jacket or overblouse. This is beautiful worn over a dress or a camisole.
One pattern which works well for both an overblouse and a jacket is Vogue 1165. You can eliminate most of the work by making the roll up sleeves (View B) rather than the cuff and placket version. You can use sheer fabrics such as Chiffon, Georgette and my favorite, Silk Organza.