Textile printing pretreatment liquid, textile printing ink set, ink jet textile printing method, printed textile, and onium salt compound

A textile printing ink set comprising:

• a textile printing pretreatment liquid comprising, water and an onium salt compound represented by Formula (A) below or Formula (B) below,
• where, in Formula (A),
• RA1 to RA4 each independently represent a hydrocarbon group that may include at least one of an aromatic ring, a hetero ring, an ether bond, an ester bond, or a substituent,
• at least one of RA1 to RA4 is a hydrocarbon group that includes at least one of an ether bond,
• an ester bond, a hydroxy group, or an allyl group and that may include a substituent,
• at least two of RA1 to RA4 may be bonded together to form a ring,
• X+ represents an ammonium cation or a phosphonium cation, and
• Y− represents a counter anion,
• in Formula (B),
• RB1 to RB6 each independently represent a hydrocarbon group that may include at least one of a hetero ring, an ether bond, an ester bond, or a substituent,
• at least one of RB1 to RB6 is a hydrocarbon group that includes at least one of an ether bond, an ester bond, a hydroxy group, or an allyl group and that may include a substituent,
• at least two of RB1 to RB6 may be bonded together to form a ring,
• two X+'s each independently represent an ammonium cation or a phosphonium cation,
• two Y−'s each independently represent a counter anion, and
• L represents a divalent linking group;
• and
• a textile printing ink comprising water and coloring resin particles,
• wherein the coloring resin particles contain an oil-soluble dye and a polymer P including a hydrophilic group.