I have prepared very simple pillowcase tutorial for beginners. You can sew perfect pillowcase in about 15 minutes. I have used tapestry (jeans needle) but you can go with any fabric you like (recommended none elastic).
My final design of pillowcase will be size: 43 x 46 cm so please prepare strip of fabric which is 46 x 120 cm.
First we need to double fold and sew ends about 1 cm deep.
Then you need to fold the fabric and create desired length of pillowcase 46 cm.
Pin it all around and make sure the fabric is perfectly flat.
Sew it on the right side first. Use zigzag stitch to prevent the fabric from peeling and then use straight stitch just above it 0.5 cm from the edge.
Then turn the fabric on the left side and sew on both sides keep about 1.5 cm from the edge.
Turn it back on the right side and you will see the result! This tube pillowcase is amazing! Now you can sew as many simple pillowcases as you want in no time.