I am a waldorf early childhood teacher in CT, so thats lotsa kids under 6 in ALL kinds of weather for long periods of time. I have seen and used lots of different types of rain gear. I ordered an oakiwear for my 5 year old son. First the design/size: I ordered a size 7 and Im so glad I did! It fits great and he can wear all of his snow gear underneath no problem. The hood stays on great and its not flopping down in front either, the jumpsuit design is perfect though it would be nice if they had an overalls and coat option for days that get hot. They could keep on the overalls but take off the coat.  I love it for damp days in the sandbox and tree climbing, its durable and easy to clean. What I don't love it for are the days where it is pouring down rain and we are having a blast playing outside, which in the fall and spring happen quite a bit. Today was one of those days, and it was chilly enough to still wear our snow gear underneath. When I took off my sons rain gear all of his snow gear was damp on the outside. (This has been true each time hes worn it not just today) Now, that being said his snowgear is obermeyer, it is meant to get wet too, just not pouring down rain, hence the oakiwear. But he was totally damp inside. I have read a number of reviews here and some are from a few years ago. One says theres a mesh on the inside of the oakiwear, there is not. So maybe they changed their materials but no, no mesh. I only bought this oaki about a month ago and I expected more from it. I am glad I also bought Playshoes overalls and jacket. They are the best I have seen on the playground but because they are from Germany you have to plan ahead,( that is why I tried the oakiwear too). They are also either fleece or cotton lined and hold up for years.
My son loves his oakiwear and we will keep them but they are not my first choice for a rainy day :(  also, I love Abeko rainmittens and reccomend then for everyone. If you add a knit glove or mitten they are perfect year round and stay on well! Tuffos are great for toddlers in all weather, though I have seen some wear out.  Anyhow, playing in the rain is the best!! Damp is better than soaking and oakiwear is great for the wet sandbox and ground, quite durable, just not for pouring down rain.