This is an amazing piece to be able to make. You can make so many version of it with fleece, which I have used here, or you can use wool to make it warmer. Maybe even add a softshell coat to make it wind- and waterproof?
Before you do anything; remember to wash your fabrics before starting to use them. All fabrics shrink a little the first time you wash them and you want that shrinkage to happen before you make a fitted pajamas for your dog. If you make the pajamas and then wash it, it will probably end up being too small.
You can download the two patterns here. Chest piece and front leg. It's perfect for iggies with back length 35-39cm. It's the pattern I use for Luigis outfits. Copy & paste the links below in your browser and it should come up.
PS. If you make this, PLEASE send me an image of what you have made so I can make an album after a while showing reader-made clothes. You can send it to firstname.lastname@example.org labeled Iggy Pajamas!
This is the main shape we're going to be using. Because I'm unsure as to how to share this with you, I'm hoping the sizes on the image will help you re-create your own version with the adjustements you need. This is one side of the piece.
Ignore the text on the fabric.
We're going to go ahead and cut out the main piece. Fold your fabric in half before cutting. This way, the edge on top gives us a straight back and we get one large piece instead of two pieces that we have to sew together.
This is what it should look like.
This is the piece for the front legs. Using a different colored fabric for the leg is a personal choice; you don't have to do the same.
As you can see in the bottom images, there is a trimming at the bottom of each leg. We're going to cut those out now. You decide you tall you want it to be; I wanted mine to be slightly shorter than 3 cm so I cut it out 6 cm tall. When I sew this in, I will be taking 1 cm so it'll end up being around 2 cm tall. Cut out 4 of these for each leg.
Use some scraps to figure out how long you need to make the scarf. After you figure out how tall you want it, you cut it out the same way as the strips above.
This is what you should have. Four strips for each leg and a big one for the neck.
We're just about to start sewing, so you have to decide which side of the fleece you want out (the side that will be showing when you are done). I chose to have the fuzzy side out this time.
I decided to put on reflective bands around the legs. This is optional, of course. Remember to sew these on the side that is out. For me, that is the fuzzy side. Sew these on and move on to the next step.
Now it's time to sew the trimming on the legs and the neck. Fold your piece in half and have the open side facing down as shown on the picture. Sew around 1 cm in.
This is what you should have now. Neck is sewn on as well as the reflective bands and the trimmings.
Flip it over so you have the inside facing you. We're going to make the edges that aren't being sewn together with anything a little prettier. This is the edges around the stomack and back. Leave the circles at the front which are for the arms. We do this so it doesn't rip as easily and it looks much better.
Here is a close-up shot. Try to make it as even in size as possible. Fold in around 1 cm and sew.
Now that our edges are nice and pretty, we're going to sew together the backlegs. In the picture, one leg is already being held together by pins and the yellow lines on the other leg is showing the two edges that are being sewn together.
Here is one leg sewn together and flipped right side.
Now we're moving on to the front legs/arms.
Here is a close-up of the leg and body stitched together before sewing.
Now that the legs are sewn on, we're moving onto the last couple of steps. Make sure the main pieces outside is faced up. I have marked with yellow which sides are being sewn together. Below is a picture of the piece from the side before being sewn.
Yellow is where you sew and blue is where DON'T. Do NOT sew the blue areas.
Final step! Line up the final pieces, which is the two front legs and chest area and sew in one continious line. Turn inside out and you're done!