I'm waiting for JCrew to deliver my navy sheath dress. I'll post it once it does.
Una, trousers are definitely an option too. JCrew always has these lines, so adding on at a later time should not be an issue.
Ingun, Rachylou and Deborah, I hear you! I kind of see your comments as opposite sides of the same coin. If I go with trousers or a skirt, then I have more options to mix it up with different styles of tops and sweaters. If I go with a dress, I have duplication and fewer options to mix it up with tops (although the style will work with a top underneath, it will pretty much have to be a button down or a turtleneck style), but I also have simplicity. I can wear the sheaths alone, with the jacket, with a top layered underneath, and with a top layered underneath and a jacket. Wearing them alone will be simple simple simple. I'm leaning toward simple anymore.
I'm thinking this through a bit based on your comments. I was shying away from the pinstripe sheath because I was feeling like the plain navy sheath was going to give me more versatility. Maybe I'm overthinking it, though.
A pinstripe is a non-patern patern, isn't it? Maybe I should go with a navy pinstripe sheath, a navy pinstripe jacket and a navy pinstripe trouser. So many choices!