After last year's holiday hiring frenzy, retailers are showing more restraint in ramping up their staff for the crucial holiday shopping season.

After a surge in overall holiday hiring last year to a 12-year high, shaky consumer confidence and increased retail efficiency and online shopping may prevent similar gains again, according to a forecast from outplacement firm Challenger, Gray & Christmas. Retailers are likely to at best match the level of holiday hiring that occurred last year, the firm added.