General synonyms:
* Dressmaker (especially for women's clothing)
* Seamster (a more old-fashioned term, often used for men's clothing)
* Couturier (a high-fashion designer and tailor)
* Haberdasher (a person who sells men's clothing and accessories, sometimes including tailoring services)
More specific synonyms:
* Alterationist (someone who alters existing clothing)
* Customizer (someone who creates unique clothing)
* Schneider (German for tailor)
* Sastre (Spanish for tailor)
Figurative synonyms:
* Craft (a skill or art, especially a traditional one)
* Refine (to improve something by making small changes)
* Shape (to mold or form something)
The best word to use will depend on the specific situation and the tone you want to convey.