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SANTA_HAT_MODEL = Model('models/player/holiday/santahat.mdl')

        prop_dynamic_override = Entity.create('prop_dynamic_override')
        prop_dynamic_override.set_model(SANTA_HAT_MODEL)
        prop_dynamic_override.spawn_flags = 256
        prop_dynamic_override.set_parent(player)

<Entity>.set_parent(<Entity>, <Attachment Index>)

from entities import CheckTransmitInfo
from entities.entity import Entity
from entities.helpers import index_from_edict
from entities.hooks import EntityCondition, EntityPreHook
from memory import make_object
from players.entity import Player

hats = {}

def transmit_filter(entity, player):
    return player.index in hats and hats[player.index] == entity.index


entity_condition = EntityCondition.equals_entity_classname(
    "prop_dynamic_override")


@EntityPreHook(entity_condition, 'set_transmit')
def pre_set_transmit(args):
    entity = make_object(Entity, args[0])
    edict = make_object(CheckTransmitInfo, args[1]).client
    player = Player(index_from_edict(edict))

    return None if transmit_filter(entity, player) else False