This is a very basic pattern for a seamless, top-down raglan t-shirt. I tried to make it clear enough even for beginners. The shirt is done in stockinette with knit1purl1-ribbing for the seams.
It is a quick knit that gives a fitting shirt with just a bit of ease. Easiest way to put it on the doll is feet first. It is here shown on a Paola Reina boy, as there are not too many pattern specifically for them, but should fit even Les Cheries and Littlefees. And of course you can knit it for your girl, too.
Being a basic pattern, it gives lots of possibilities to variations. It gives room for embellishments and embroidery or patches. It can be lengthened in the sleeves and/or body by simply doing more rounds in stockinette. It can be done in more than one color: why not knit the sleeves in one or two contrasting colors?
Have fun!