I boost my AI2 as well as my pockets, so I do get more absorbancy. As long as you don't get leg gape, you can boost anything. Even AI1s!

What I've even been doing lately is that I have a pile of pockets & AI2 shells in "large" that there's no way Will will fit into for ages, so I've been using them as covers for fitteds! It means that I get to use my gorgeous fuzzibums now!