Here's a little visual guide if that helps:
Ahemmusa:
http://www.uesp.net/wiki/File:MW-npc-Assamma-Idan.jpg
http://www.uesp.net/wiki/File:MW-npc-Sinnammu_Mirpal.jpg
Erabenimsun:
http://www.uesp.net/wiki/File:MW-npc-Odaishah_Yasalmibaal.jpg
http://www.uesp.net/wiki/File:MW-npc-Manirai.jpg
Urshilaku:
http://www.uesp.net/wiki/File:MW-npc-Kurapli.jpg
http://www.uesp.net/wiki/File:MW-npc-Sul-Matuul.jpg (Not necessarily complete with magical shield; that's from one of his gauntlets.)
Zainab:
http://www.uesp.net/wiki/File:MW-npc-Ashibaal.jpg
http://www.uesp.net/wiki/File:MW-npc-Ashur-Dan.jpg
http://www.uesp.net/wiki/File:MW-npc-Kaushad.jpg
Generic Expensive:
http://www.uesp.net/wiki/File:MW-npc-Zallay_Subaddamael.jpg
http://www.uesp.net/wiki/File:MW-npc-Nibani_Maesa.jpg (Worn by this http://www.uesp.net/wiki/File:MW-npc-Sirilonwe.jpg in Vivec as well, oddly enough)
http://www.uesp.net/wiki/File:MW-npc-Sonummu_Zabamat.jpg
I can't find a good picture of the shoes so here's http://www.uesp.net/wiki/File:MW-Icon-shoes_expensive_1.png.
Cheaper great house clothing is fairly common too.
They typically wear http://images.uesp.net/4/4c/MW_ChitinArmor.jpg and http://images.uesp.net/e/e6/MW_NetchArmor.jpg (boiled or otherwise) armour. http://images.uesp.net/a/a6/MW_BonemoldArmor.jpg in the generic (centre) and gah-julan (left) styles is popular with the http://images.uesp.net/4/46/MW-npc-AshuAhheFull.jpg and Zainab (maybe just http://images.uesp.net/c/cb/MW-npc-Ababael_Timsar-Dadisun.jpg in the latter's case). Although that shield is a holy shield, which are enchanted by the Temple, so perhaps the Zainab just buy their bonemold shields. The Erabenimsun are more aggressive their weapons and armour have some unique enchantments, so I think they either make it themselves or take it off the bodies of house dunmer. In fact their ashkhan has glass axe, which is extremely expensive for an ashlander.