I'm looking for a good clothing mod, not armor, clothing. Does anyone use cool-looking ones? I've used the Nexus but it's not getting anywhere.

Not sure if you're playing a male or female character but if female I would suggest http://www.tesnexus.com/downloads/file.php?id=28765 by Korana. I would recommend all of her clothing really, its really great, you can click on her name on that page and it'll show you her other uploads.

Sorry that would've have been helpful for me to specify, I'm playing a male one.

AlienSlof & Kikai make a lot of unique male clothing but some people find it too risqué however. I won't link to it from here as its almost all advlt related but if you search Nexus you should be able to find them if you're interested in that. For more conventional tastes I don't really know of much male clothing other than the replacers of the default clothing to fit Robert's Male Body, or various robes mods like http://www.tesnexus.com/downloads/file.php?id=4072.

Hopefully you get some other suggestions from others

Like these?
http://www.tesnexus.com/downloads/file.php?id=13966 / http://www.tesnexus.com/downloads/file.php?id=15617
http://www.tesnexus.com/downloads/file.php?id=12641
http://www.tesnexus.com/downloads/file.php?id=15477
http://tesnexus.com/downloads/file.php?id=5129
http://www.tesnexus.com/downloads/file.php?id=32599
http://www.tesnexus.com/downloads/file.php?id=17597

If you want good retextured vanilla clothing: http://www.tesnexus.com/downloads/file.php?id=3975

My favorite
http://www.tesnexus.com/downloads/file.php?id=10568

I only play female characters, but one mod I use a lot that would also look good on a male character is http://www.tesnexus.com/downloads/file.php?id=3901 by Kafei.