Just my ideas on this:

             1)In heaven we will wear robes but Adam and eve were created naked. why???why did
     they not have robes?? likewise why will we have robes instead of naked as they were????

        I think if I am not mistaken that the fall caused Adam and the woman to KNOW they were naked.Before the fall
     they did not KNOW they were naked.Also our robes will be like the LORD's - I submit robes of light or something
     similar - not clothing as we know.Best shot on this one....HEH

             2)I am curious in Jesus time and early history(creation-1700's or so) what did they were for
     swimming we have trunks and Speedos and one and two piece suits but did that have anything or what???

        Do a GOOGLE search on older swim attire in history - may find something that way.I am assuming they kept the
     clothes that they had on.

          3) was underwear something that they had back then or were they just naked under there clothes?? I am curious
     about these things also curious what we will wear in heaven. will we have undies?? clothes like pants, shirts,
     kilts, highland wear, or just the robes??? what will we wear for swimming or will we skinny dip??

        I don't think they had undergarments per se.Again Google search might turn up something...As above, I think the
     robe in Heaven won't be clothing as we term clothing - it will be the radiant light of the glory of GOD so we could actually be naked underneath yet not have ouyr "clothing" affected by water..

          I am sure this sounds weird maybe even why should I care but I am curious I seek knowledge about this and thought  those better versed in the bible and in customs etc of older times (biblical etc) would be able to help.

          Paul