Corgarr - try looking at Aleanne's clothing mods 1 and 2
Here's the link http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=1183 http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=3085
Aleanne did a number of outfits similar to the Arena box art
You then need a companion - as mentioned there are a number of prebuilt companions - you could try Emma's http://lovkullen.net/Emma/witchgirl.htm or http://lovkullen.net/Emma/laura.htm or even http://lovkullen.net/Emma/Constance.htm
All the companions have companion sharing available so you can just give the companion the outfit of your choice - don't forget to post screenshots