Here is my 2 cents for comparison.
As far as fit, I agree with others here. Waders should NOT have to stretch when you squat to deal with fish or snags or whatever. Baggy is better and besides, it allows you to wear warm clothes under your waders. I wear my wader more in spring and fall when it is cool and I need the extra clothes.
As far as seam numbers, sealing, etc, all of that is related to the brand and design you buy. I am not qualified to comment on wader design, but it stands to reason, the less seams, the less chance of leaks.
My brand experience has been good. I have a pair of Hodgeman WadeLites I have had for about 8 years. I use them about 10 - 15 times per year or so and they just started to leak this spring. I coated them with a sealer to buy a few more months, but I got my money from them. My wife has a pair about 3 years old and no problems. I bought 2 pair of the Cabelas breathable waders, about $140, for 2 of my sons about 2 years ago. One of my son's uses his frequently and he has not had any problems. My second son has only used his 2 or 3 times and no problems. Maybe I bought the only 2 pair that did not leak.
For me, I plan on replacing my Hodgemans with a pair of Simms this summer some time. I just want to upgrade and I like their quality. Plus, I go to Bozeman, MT a few times a year and I like to support the local economy.
Dr Bob
Bob Widmaier
My biggest fear when I die is that my wife will sell my fly fishing gear for what I told her I paid for it!