The level of protection offered by bibs is superior to any substitution. The chest and back panels supply additional warmth, optimizing body heat and also prevents snow from finding its' way into unwanted areas. The Boulder Gear Nestor Bibs extend to reach the top of the chest and have adjustable shoulder straps to manipulate the fit as you add and subtract layers on the torso. Young ones grow fast. That's why the Nestor Bibs have Grow Cuffs, allowing the legs to extend up to 1.5".