To start iron the dress fabric in half to give you a centre as a guide line for the pocket and for cutting out the arm holes.
Measure to the left 2 inches from the centre line and 6 inches from the bottom of the hem line. Place pocket and sew.
Like this with opening at the top.
Fold dress in half where at the ironed centre line.
Place armhole template on the folded fabric and draw the outline. Cut out armholes all 4 layers of fabric.
Now your ready to fold over the top of fabric to create the casing for the elastic to slide through easily.
You can add another seam at the top of the casing to make a nice ruffled look.
Use a safety pin to pull elastic through the casing.
Now for the shoulder straps pin them in place then sew both at the same time .
This will form the shoulder strap.
Sew over both the ends of elastic at the same time.
Iron the straps first flat then fold in half to to create a centre guide line.
Cut in half to make 2 at the length for the size dress you are making.
Open the ends sewing right sides together.
Open the binding and lay the underarm hole first and pin.
Oh yes, it helps to snip the curve of the armhole before sewing on binding.
Making sure the top part of the elastic stays free.
When you get to the top part of the shoulder strap hold elastic towards the middle of the fold.
Then sew the strap closed. (Hint)When you stop to adjust,stop with the needle down.Take it an inch or two at a time.