Peaches n cream might end up heavy (isn't one of those big skeins almost a pound?), but it could work. it might be a little stretchy if you use a lacy or open pattern (it might stretch out of shape more than you want). What about something lighter like cotton ease (lion) (which is cotton and acrylic) or a cotton/bamboo or a cotton/silk blend?
and 100% bamboo is very breathable and light- I used Royal Bamboo to make a camisole and it is sooooo soft and nice... I'm using some bamboo from discontinuednamebrandyarn (SWTC?) to make a sort of shell and it is extremely light weight, and it wasn't very expensive, as I remember. (I only need 3-4 balls out of the 10 ball bag)
My mom has given me some egyptian cotton (thanks mom!) to make another Monica tank for my daughter and it is very soft and has a nice sheen. (but I haven't cast on yet- soon!)
just a few ideas....