The convertible dresses are from http://www.henkaa.com some people may think they are pricey but they are great quality material (not jersey cotton) and come in three lengths. They also will send swatches...when I was looking at ordering for my girls the swatches were free. There are other convertible dress options on line as well if you search on BDW you can find some threads about it, or just google it.
The guys grey pants, FI's vest and the purple shirts are from Le Chateau. The main reason we went with Le Chateau is because the vests they sell there are nice and have the same material material on the back of the vest as they have on the front, not the thin shiny stuff most suit vests are made of. This way he can wear the vest alone without a jacket over top of it.