Hmmmm... ...
Well, I'm not going to use anything better than Chainmail.

That was decided long ago.

No helmets either, maybe Ion Stones.
So let's see,
Robin Hood:
Ranger_Archer
Main weapon : Long Bow
Secondary weapon: Long Sword
Friar Tuck:
I never really envisioned him as a front-line fighter so maybe Fighter dual to Cleric? Then he can use Bows I think, from the fighter class.
Will Scarlett:
Fighter, dual to Thief.

Or Thief dual to Fighter?
Maid Marion:
Eh... ... I think nevermind about her.
Alan A'Dale:
So he's the Bard eh? He's in.
I guess Nalia will be my 6th member, to compensate for the utter lack of mages in the party.

Unless there was a good mage in Robin Hood tales? Not his sister mind, she's evil.
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If not a Sorcerer, then a Paladin.