Enchanting Clothing

[powerdemon]

http://www.giantitp.com/forums/showthread.php?t=198570&

Since replying in that thread would be necro:

What would a Robe of the Archmagi be considered for enchanting with the +x bonus enchantments? +5 because of the armor bonus? More with all the other bonuses?

[Cog]

It would be considered a custom magic item, and so it would be something to discuss with your DM to determine what's appropriate for your campaign.

[Xtomjames]

"Robe of the Archmagi: This normal-appearing garment can be white (01–45 on d%, good alignment), gray (46–75, neither good nor evil alignment), or black (76–100, evil alignment). Its wearer, if an arcane spellcaster, gains the following powers.
+5 armor bonus to AC.
Spell resistance 18.
+4 resistance bonus on all saving throws.
+2 enhancement bonus on caster level checks made to overcome spell resistance.

If a white robe is donned by an evil character, she immediately gains three negative levels. The reverse is true with respect to a black robe donned by a good character. An evil or good character who puts on a gray robe, or a neutral character who dons either a white or black robe, gains two negative levels. While these negative levels never result in lost levels, they remain as long as the garment is worn and cannot be overcome in any way (including restoration spells).

Strong varied; CL 14th; Craft Wondrous Item, antimagic field, mage armor or shield of faith, creator must be of same alignment as robe; Price 75,000 gp;Weight 1 lb."

I'd say it's a +8 item, maybe +9. The +5 to AC is a +5 bonus, the SR is a +2, the other two parts are +1 in total. Over all cost is consistent with a +8 item.

[Siosilvar]

You can price it as Tom did, or you can go with "+5 armor with 50,000gp of extra flat costs".