First off, let me just say that I have no idea what these poses are about. They are both a bit crazy.
This is KS 2605. Their sizes in the envelope go from 4-7. My girls are three and skinny for their age. I downsized the pattern by one size and it fits really well. The only thing I should have done is increased the length of the torso by about 1/2" My girls are skinny but tall. This red suit is snug but will certainly be fine for January. I plan on making four suits total and giving them to the girls for Christmas. They'll never remember this suit until they open it on Christmas day. Then it'll be a Gift and that will make it exciting.
It is a nicely designed kid suit. The only change I made is to line the entire front of the suit with swimsuit lining.
I have the three others cut out and sewn together but, in my wisdom, I only bought enough elastic for two swimsuits. So the other ones are partially put together. When you assembly line items like this they go together really, really fast.
Happy Turkey Day to my US friends!!