Waders are definitely hit or miss. Manufacturers strive for that "universal" fit, but often miss the mark, because there is not necessarily a strong correlation between the height, weight and shoe size of an individual. And sometimes, they really screw up, and they have "manufacturing sizing issues", which is what one vendor told me, when I could practically climb inside a single pant leg of a pair of waders I had purchased. I'm a tall, thin guy, so I need long legs, size 11 booties, but probably what amounts to a small waist belt. I'm usually swimming in a large (sometimes literally, but usually figuratively), but mediums are too short in the legs and the booties are too tight. Some of the vendors sell a medium-long (or equivalent), to try and accommodate a few more variables about a person's body size.
Ultimately, I switched to wearing wading pants a number of years ago. The one pair of Patagonia chest waders I own, I wear as wading pants 85% of the time. This reduces the fit issues somewhat, but does not totally eliminate them.
And ultimately, ultimately, I find that all my waders leak, whether they fit or not