Bodgetandscarper that is beautiful fabric, just love the colourings on this fabric. My take on the lining would be a very pale grey. if however you are wanting to make a full length slip then this would be in a flesh colour - so much nicer in having a uniform colourway, i.e. your body and bra/slip in the same colour rather than blocks of light and darker colours underneath. I personally cannot abide seeing colours of underwear showing through the top layer, and for a wedding think it is more important to have an all toning flesh colourway underneath. Flash photography can cause some mishaps in the photographs, and I am sure you do not want this to happen.
By the way where did you get your fabric from, what is it called - thanks.