Originally Posted by imxer
. . .Height, chest or waist, depends upon the water depth you are fishing/crossing. . . .
Imxer, I got the impression that it was hip waders she was looking for. And since hip waders can be snapped down to knee level, they're hard to beat for both mobility when walking out of the water and ease of on/off. For 4-5 times a year, I'd suggest she stick with these boot-footed, and if he gets into the sport more, he could then move up to breathable chest height with stockingfoot (foldable down to waist height) and wading boots to access more area wading.
And I would add, Frank's absolutely right. He needs to pick out his own waders.
Just my opinion, having both . . .