Wow! The consistent answers for #1 are VERY helpful, everyone. I guess I need to find someone to take in the waist, because I loathe doing that type of alteration myself. I do want it done. The pants sure aren't going to fall down, but the excess material in the back juts out and tops can get hung up on it.
Thank you all especially for being patient with the black pictures. I adjusted these a lot and they still aren't very good for showing detail. The scuba pants were definitely the worst.
I'm also surprised but fascinated by the "minority report" for #4. They are definitely the most like pants, but also had the poorest fit. The rise is the lowest, which is a consideration because the lower the rise = the least comfortable for me. CocoLion noticed the crotch bunching, which is a very typical problem for me. It's really only solved with bespoke pants, because I need extra depth in the back crotch. So while I like this direction, it would take a lot of work and expense and time; I'm not sure the cost/benefit is positive yet.
kkards, these are indeed all the same line. I did that on purpose for several reasons: (1) Plain leggings from this line fit me very well, and consistently and are quite good quality. (2) They have a wide assortment of sizes, including talls, which are very difficult to find consistently. (3) The price is very reasonable, and my budget is quite limited even for this hole. (4) I have reasonably high confidence of being able to replace any of these when they wear out, or when my weight falls and I need to size back down.
And thank you all very, very much for the kind words about my extra curves. In happy news, it is finally a chilly morning here, and I will be wearing this awesome cozy item around the house.