1 Kings 10:5 describes the splendid apparel in Solomon's court — a concrete example of the royal luxury Jesus mentions.

2 Kings 1:8 describes Elijah's coarse garment — the OT pattern for John's rough clothing, contrasting with the soft garments Jesus mentions.

Esther 5:1 has Esther wearing royal robes to enter the king's presence — exactly the splendid attire Jesus says belongs in kings' courts.

Matthew 3:4 directly describes John's camel-hair garment and leather belt — the very austerity Jesus contrasts with royal luxury.

Lamentations 4:5 describes those who once wore purple and feasted now in ashes — echoing the luxury Jesus mentions, but with a tragic reversal.

Esther 4:2 shows sackcloth was excluded from the king's gate — illustrating the norm that kings' courts require fine clothing, as Jesus notes here.

1 Timothy 5:6 warns that a self-indulgent widow is dead while living — using the same 'live in luxury' phrase (τρυφή) as Jesus, but with spiritual judgment.

Revelation 18:3 condemns Babylon's excessive luxury — using the same Greek root (τρυφή) as Jesus' description of those who live in luxury.