There are several occupations within the textile industry that deal directly with textiles;
Textile Designer.
Haberdasher
Weaver
Seamstress
Tailor
Someone who works in textiles is commonly referred to as a textile designer or textile worker.
Tech Person
a slave
Employee
someone who works for a business
An employee.
keelman
moofer
A mathematician
A vulcanologist.
hydrologist
A Chronogist