No gloves.
But you could get bracers of striking (1,310gp, gives the wearer unarmed strike if they don't have it already, and can be enchanted as a blunt double weapon (both "ends" must be identical, applying those abilities (enhancements, special abilities, etc) to all the wearer's unarmed attacks.
That one is in Magic of Faerun.
In Savage Species, is the Necklace of Natural Weapons. It costs 600gp base, plus a variable amount based on how powerful it is.
What you do is, set the enhancement and special abilities the Necklace gives; figure out what that'd cost to put on a weapon. Multiply that cost, by how many natural weapons it affects (for monks, I suggest assuming "two is enough", to keep it balanced wiht the Bracers, above). That is what you add to the 600gp.
Some suggestions, drawn on several sources:
Necklace of (2) Natural Weapons: +5, Force, Sweeping, Grasping.
... Equal to: a +10 double-weapon
... Market Price: 400,600gp
... Effects
... ... Force: adds +1d6[force] energy damage, and can affect incorporeal creatures with no miss chance.
... ... Sweeping: adds +4 to trip checks
... ... Grasping: adds +2 to Grapple and Disarm checks; disarms do not provoke AoOs.
A 20th level monk tricked out in these woudl do, before Strength bonusses, 1d20+5+1d6[force] damage, have +5 to hit, affect incorporeal creatures normally, penetrate up to ?/+5 DR, and give bonusses to disarm, grapple, and trip attacks.
Bracers of Striking: +5, Force, Impact, Stunning
... Equal to: a +10 double-weapon
... Market Price: 401,310gp
... Effects
... ... Force: see above
... ... Impact: for bludgeoning weapons, what keen is for slashing and piercing
... ... Stunning: adds +1d6[sonic] damage, and on a critical hit, the target must make a save (Fortitude DC 17) or be stunned for one round.
This would make for 1d20+5+2d6, with a broadened crit range and a crit-ependant chance to stun your target.