First of all - do you wear wool soakers, or just wear wool shorts?
When my kids wear wool, thats all they wear. No shorts, pants or other items. They are 18mth twins and wear them to baseball games, the park, grandmas, out to dinner.
Do you change them every time you change baby? If not, how often? NO, If its lanolized well, with a great product, its not needed.
How do you keep the wool from getting ruined when they start moving around and getting into stuff? Do you just start to use stuff that's harder to ruin (like PUL or something)?
We have knitted wool thats our pretty wool. No outside playing or baseball in those. Normaly Em wears hers under a sundress and Jack with a matching shirt I embroidered on in colors to match the soakers. Then they have knitted/crocheted/felted wool covers that are to take the beating. They can wear those anywhere. It all holds up in the long run. A good fabric shaver keeps even our playwool looking like our pretty wool.
If you use a lot of wool, does that mean you don't use any onesies? What do you pair with the wool pants, just a t-shirt?
Em wears sundresses or cute suntops with her wool. I have been known to dye a white shirt to match her wool. I prefer them to have outfits with the wool, but no 18month old keeps a shirt clean all day.

Jack wears his with other matching shirts. A pair of Amazonas HPY knitted soaker which is all greens with a bright orange polo type shirt. We have made wool our complete summer wardrobe and will do for the winter as well. Keeps it easy to keep up with.
We do have some very nice outfits that we use aios under. I also have trimmer wool covers from Fussybutt and LilWitchybrithces that have embroidery on that we can use under thier good going out clothes.