For SAI, we were told all white. No specifications of dress/skirt/pants--it didn't matter as long as it was all white. We were told to only wear our pledge pins and no other jewelry (unless you were engaged, then you could wear the engagement ring). We were also told that shoes didn't matter, but that we had to wear all white socks (including the lack of the pink line across the toes). I just borrowed the dress my sister wore for her AGD initiation.
For Phi Sig, we were told to wear all black from head to toe. Simple enough.
For AGD, there wasn't much discussion about the dress I needed to wear because I knew I was wearing my sister's dress again.
Because of my difficulties with walking, the chapter allowed me to wear white flats instead of the required heels, but the shoes did have to be all white. Again, no jewelry.