By really big I mean mostly adding a ton of clothes to the game. I have been looking around nexus but nothing really catches my eye that much. Theres a few things here and there, but it seems just about everything uses divine elegance, so I'm not sure about conflicts. The clothing selection in The Elder Scrolls IV: Oblivion is the greatest game in the history of the universe. to put it nicely and so I figured I would ask for those that new about more of the mods then I do. Basically I am looking for something with more varities of pants and shirts. Everything looks like it is either made for the poor or made for nobility with the silk/velvet stuff. There is no inbetween. Morrowind had so much more stuff. I'm also looking for some cloth gloves as I'm using that galerion unarmored mod so I'm trying not to wear light armor, but don't want to go bare handed. Mostly I'm looking for dark or black type of clothes, which I can't find any, since I'm playing a ranger/thief/assassin type character and a robe doesn't really fit. Any help would be great.

http://tesnexus.com/downloads/file.php?id=27474
http://tesnexus.com/downloads/file.php?id=28643
http://tesnexus.com/downloads/file.php?id=9064

May not be exactly what you wanted, but I haven't seen all the clothes these add. But it definitely improves the variety

For HGEC theres Apachii Goddess Store. Prety Big (not linking, copy name into nexus search)
and similarly theres the Apachii Heros store too for the lads!
These are both new shops so no real conflicts (the Heros store does conflict with somethings, but thare are some patches availble too)

Well I found some stuff, but it seems there isn't a whole lot made for just the normal game without a body mod. I am apparently one of the very few oblivion players that doesn't see the point of playing a character that has boobs the size of watermelons when you don't see them during gameplay anyway. Sadly there doesn't seem to be very many pants added in mods, and pretty much no new shoes. Not really a fan of seeing the ankles constantly.

As for the boobs being the size of watermelons, 'tgnd' (The girl next door) has the most.. uh. normal? sizes? lol. best I can explain it. cant link it, but look it up on Nexus.
It really depends on what body replacer, if any, your using. I suggest Robert's male, and it sounds like you would like tgnd. If it's not too hard, I might be able to make a few pieces of clothes, if you can give me an idea to work with. And btw, Robert's male body replacer has a underwear that looks more like men's boxers.

I don't play with any body mods, just the normal male characters. I was mostly just hoping to find some variety of clothes like in morrowind which sadly oblivion doesn't seem to have. There are very few pants to wear really and all the shows are like super short leaving the ankles bare. The worst part though is that black isn't really black in this game.

Well there is also http://planetelderscrolls.gamespy.com/View.php?view=OblivionMods.Detail&id=2070 - but it does add a lot of stripper clothes that are not very lore friendly.

I'd like to see an edited version of that without such clothes.

Well, I know pretty much nothing about texturing, but if it's a length problem, it wouldnt be too hard to just stretch the pants a little bit lower in Blender 3D, if you want me to do that for you. I never noticed the ankle problem, just me though. And I always play with body mods (i hate the segmented shoulders!) I can understand playing without body mods on a lower computer though lol, I know that feeling all too well! If I were to extend them, how long would you want? down to the heel? or just pass the ankle?

This might help since a couple of folks commented about NPC New Clothes:

http://www.gamesas.com/index.php?/topic/1151411-relzbeta-npc-new-clothes-more-realistic-clothing-choices/