So, you will need:
Fabric (I'm using the same misprinted t-shirt from the lavender hottie tutorial)
Sewing machine (you could do it by hand but it will be time consuming)
Iron (can deffo be done without, but it does help)
You're going to cut out a square of fabric - mine is for a smaller dog so the measurements I used were roughly 18cm by 18cm. I used a piece of paper to make sure I had the right size and that I cut a perfect square.
After this, fold two opposite corners in so that they create a straight edge in place of the corners. This will create the pocket that your dogs collar is going to go through so make sure it is over twice the width of the collar - mine were about 6.5 cm but to be honest, I should have gone a little bigger. Sew these corners down in a matching colour thread. It's easier if you iron them down first!
Fold the square right sides together - so that the bits you just sewed can be still be seen - and iron it down flat. Then, starting at the bottom of one of the folded corners, sew along the edge to the other side. Make sure not to sew up the folded bits! At the point, cut some of the excess fabric off to make the point look better once it's turned the right way round. Mine looks super messy but it doesn't matter because it will all be hidden.
After this, turn it inside out - so it's the right side out really - and you should have an almost finished bandana! This can take a lot of fiddling and time but it'll get there in the end! Use something pointy to get the bottom of the bandanna out fully. After that, just give it another iron to make sure it lays flat, then sew in a straight line across the top from the bottom of the folded sections to create a tube.
And you're done! Put it onto your model's collar and let them show it off.
Are you going to upcycle your old t-shirt?!