This is sewing pattern for a cap that has 2 ways to wear: with the help of the ties you get a ponytail, and by hiding the ties in the cap you get a bouffant.

This listing contains a 2 PDF files with pattern and tutorial.

The manual includes detailed step-by-step description with a lot of photos and recommendations. 
Patterns in full size with allowance. Simply print them on paper, glue them together and follow the instructions to start sewing. The description is very detailed, so even a beginner can do it.
The instructions are as simple and clear as possible, without using professional terms, for your convenience.

You'll need:
1 piece of fabric 60x60cm (23.6 x 23.6")
1 piece of fabric 46x16cm (18x6,2")
Scissors
Pencil
Pins
Threads
Safety pin
Measuring tape
Elastic tape width: 0.7-1 cm (0.3-0.4"), length: 10cm (4")
2 tape for ties width: 2-3cm (0.8-1.2"), length: 50cm (20") 
PDF Reader
Printer
4 sheets of paper (A4 or Letter)
Ruler
Sealing tape

If you have any questions feel free to ask!

All designs and instructions are for personal use only, not for resale!