Reasoning
Warcraft Tavern recommends Tailoring for Warlocks both for gear upgrades while leveling and because a craftable Faction Banner camp object grants bonus Spirit, which directly feeds Life Tap. Enchanting is paired because Forever expanded it to craft Staves, Totems, Idols, Librams and Off-hands, and because greens crafted for Tailoring leveling can be disenchanted back into Enchanting materials, creating an efficient closed loop. A secondary unverified source agrees on this exact pairing and adds Herbalism + Alchemy as a viable raid-support alternative. Source picks: Warcraft Tavern Warlock guide: Tailoring + Enchanting; Koroboost (unverified): Tailoring + Enchanting; Herbalism + Alchemy for raid support.
Confidence note
Analysis built from sourced profession facts