Ikea is also a great pace to find fabric to make this. Most of their fabric's are extra wide, bright colours and patterns, durable and affordable.
The 6 wooden poles were from B&Q. We quickly sawed the excess off, drilled a hole through and then gave them a coat of varnish to darken their colour and make them a little more hardwearing.
To keep the poles in place I sewed leather thong at intervals on the inside. I used the same leather thong to tie the poles together at the top and make a tie for the opening.
The teepee is great fun, can be changed to whatever the imagination conjures and provides a useful hideaway from afternoon sun.