To be a textile designer you will usually need a BTEC HND or degree in textiles, art and design, fashion or a related subject. To get on to a degree, you will normally need a recognised art and design foundation qualification or equivalent.
If you already have proven work experience you may be able to start a degree course without the usual qualifications.
You could take a more practical route by doing courses such as City & Guilds levels 1 to 3 in Creative Techniques in Textiles. This may help you to develop the skills needed to become self-employed as a craftsperson, or to build up a portfolio of work to be considered for a degree or other higher education course.
You will need to present a design portfolio when you are looking for work. You can also use your portfolio to make speculative applications to companies whose products match your style.