Tailors have not always been treated kindly, as far as the English language is concerned. Some nicknames are merely jocular, for instance knight of the thimble, used in the early 19th century, stitch or man of stitches, used in the 18th and 19th centuries, linen-armourer, from the 17th and 18th centuries (a linen-armourer was originally someone who made padded jackets and other garments worn with armour), needle-jerker (early 19th century), sartor (the OED, which describes the word as 'humorously pedantic' has citations from the 17th to the 19th centuries). The word snip was used as an allusive personal name of a tailor, as well as the profession itself, so one of the OED's citations, for example, from Trollope's Dr Thorne, is "Well done, Snip; go it again with the wax and thread." Snipper and snip-snapper also used to describe a tailor. Cabbage, another term for a tailor, may not be derived from the vegetable, but may be related to garbage, according to the OED (see this old post).
The OED also describes some terms for tailors as derisive or contemptuous, including stitcher, stult, pricklouse (an insult thrown at Samuel Pepys by his wife to remind him that he was the son of a tailor). The expression to prick a louse meant to be a tailor. A similar word also used for a tailor was skip-louse.
There are more slang words for tailors in dictionaries of slang, for instance billy button, which is in Partridge's A Dictionary of Historical Slang.
Tailors from the late 18th throughout the 19th centuries were dependent for their work on the upper classes, and they generally were short of work in the summer when the gentry left the cities and returned to their country piles. What we now call the silly season used to be called the cucumber season, probably vaguely alluding to tailors, who were known as cucumbers (see this old post). In a 1747 account of London trades, Richard Campbell said of tailors that they 'were as numerous as locusts' and 'generally as poor as rats'. This no doubt explains the numerous pejorative terms for the profession.