This mod replaces the N7 dress with a hi-res N7-themed Aria outfit, based off of Girlplaysgame's original Aria outfit replacer mod. Files include a .pcc and also the textures if you would like to replace a different outfit.

For .pcc installation instructions visit ELE's explanation here.
http://elemods.blogspot.com/2013/07/general-post-how-to-install-pcc-file.html

For the original model and outfit replacement instructions, please visit Girlplaysgame's instructions here:
http://girlplaysgame.com/2013/10/26/mass-effect-advanced-modding-made-easy