These are the tools of trade. And the book I bought which is very good if you're a beginner like myself.
First off, you need a pattern. I downloaded the PJ shirt from UndeadThreads and resized it to 110%. For the bottom I used a pant I bought and traced a pattern out of it, then I adjusted it some.
Then you have to place the pattern pieces with the grainline arrow parallel to the selvages and pin them.
Double check the placement before cutting as accuracy is important. Mistakes made in cutting cannot always be corrected.
Do the same with the pants.
Since this fabric tends to fray you need to apply finishing seams. In this case, a zigzag stich was used. Then, iron the piece. Always remember to iron in order to get better results.
Sew right sides together, pin the sewn right and left pants sections together at the crotch seam. Line up the inner leg seams, and match any notches. Stitch the entire seam.
Join both pants at the crotch area using pins and sew them accordingly.
Finish the waistline. Fit what you have done to the doll and see where you want the girdle to be placed at. Fold the upper edge of the waistline and iron it. Stich and leave a a opening just above the first opening in order to get the elastic inside.
Use a pin to drag the elastic inside. Try it on the doll to see if it fits. Once done, stitch several times until it's strong enough and close the opening.
Try the pans once again on the doll and mark where you want the hem to be. Iron it and stich. The pants are done!
Now with the PJ Top. This is the collar and it's kind of tricky. You need to cut it perpendicular to the selvages of the fabric. With right sides together pin and sew the collar around top and sides and leave the other side open. Turn right sides out and iron flat.
With right sides together pin and sew the fronts with the back by the shoulders.
Fold wrong sides of the cuffs together at crease line, and iron them flat. Pin the cuff to the right side of the sleeve and make sure all the seams are aligned. Stitch the cuff to the right side of the sleeve.
Fold the cuffs out so that they lay flat. Iron the seam allowances pointed towards the top of the sleeve and stich.
I didn't take photos of the rest but the rest of the explanation can be found here since I followed those instructions.
And this is how it looks once the buttons are all added!
And this is how it looks on the doll! What a great feeling to see that it fits!