So I'm trying to make a guy that looks like altair or ezio but I can't find anything that fits, thalmor robes sorta work, and I've tried others but thalmor are the closest. Are there any better ones?

What about Hammerfell clothes ?

the psijic monk stuff would probably fit nicely

hmm...well, i don't know every piece of armor/clothing in the game, but Hammerfell Garb, a Hood, Leather Boots, and Leather Bracers would have some similarities.

If you have the PC version there should be some mods over at Skyrim Nexus that recolor armor to look like the Assassin's Creed outfit. The one that recolors the Thieve's Guild armor looks best in my opinion (based on shots, haven't tried them). Couple that with one of the crafting mods that have craftable Thieve's Guild armor and you'll get the look you want easily.

Ok, thanks, I'm on console though so no mods. I'll find something.

You can find a white version of the thieves guild armor (similar to what that fence in the Flagon wears, but with hood too).

Do enough sidejobs for the TG in Windhelm and you'll get it during the special job.