No, combat robe doesn't degrade to dust. It degrades down to a "combat robe 0", and isn't nearly as effective as when it's charged, and you'll need to recharge it using Fist of Guthix tokens.
You can't, it lasts for an hour before crumbling to dust. If you used one already, get the most out of it and then alch it when done. If it's not (deg), you can still wear it for show, but if you get hit, it goes to (deg). This only means in combat, so one hour of 100% combat will turn it to dust.
any level you just have to have 99 of that skill.
Combat level in general is not relevant; specifically, you need Defense level 60.
degradable robes and armour: Combat hood, Combat robe top, Combat robe bottom, Any elemental staff, Runecrafter gloves, Amulet of Magic, Explorer's ring, Anti-dragon shield NON degradable robes: Runecrafting armour gives slightly less attack bonus than combat robes but thry dont degrade so u dant have to waste time getting tokens to recharge them (i recommend runecrafting armour. P.S. u need 50 runecrafting to get the runecrafting robes. : armour same as above but instead of combat robes wear: runecrafting robes
'Robe' is correct for something you wear similar to a coat
a long robe
a long robe
Depends on your attack and defense levels, and which quests you have completed. I highly doubt it is possible though.
Madam Malkin's Robes for All Occasions.
The women wear a robe and the men wear a cloth around their bottom.
To keep their identity a secret
cheese