Fortunately there are several surviving combat manuals from the 1400s to the 1600s which cover the use of daggers in detail, including weapon pairings. The dagger is spoken of predominately as a lone weapon, usually employed in combination with grappling and wrestling. Fiore de'i Liberi 1400 “Flower of Battle” covers this in depth.

However, you were asking about pairing it with other weapons. Achille Marozzo’s 1536 work Opera Nova is one good source, which instructs on the use of many different weapons. He covers use of the dagger alone, then covers wielding it with a cloak (yes, literal “cloak & dagger”). The dagger is held in the dominant hand while the cloak is held in the off-hand, wrapped around the hand and forearm. The reason for fighting this way was because it was not always convenient to wear a sword, and some did not own swords or were prohibited because of social class or location. Almost everyone carried a dagger or knife though, and the cloak was a normal part of clothing. The cloak was used to protect the off-hand from getting slashed as the heavy fabric would resist this for at least the first few cuts. Marozzo’s manual advises using the cloaked arm to block or entangle the opponents weapon or the arm holding it, then stab with the dagger up close. Based on other armed combat manuals from this time to a little later, the cloak was also thrown at the opponent, either to weigh their sword down or thrown over their head to blind and disable them.

The most common weapon to pair with a dagger, though, was the sword. When I say sword, I’m referring to what we in modern times have labeled a “rapier” or a “sidesword.” A rapier in the dominant hand with a dagger in the off-hand was an extremely popular form of combat, and there are multiple manuals on how they did in this time period. These manuals include the works of Ridofo Capo Ferro, Salvatore Fabris, Marozzo (mentioned above), Giacomo Di Grassi, and Francesco Alfieri (just naming a few I’m familiar with). While these works describe numerous types of tactics and techniques with the sword and dagger, the general overview is to use the dagger to parry or otherwise interfere with the opponent’s weapon so the sword remains free to attack, and as a stabbing weapon when if both fighters got bound up with each other too close to use their swords. Contrary to some modern misinterpretations, there is no special name for this fighting style. The original Italian manuals just called it “spada e pugnale” (sword and dagger).

One final note regarding dual-wielding daggers: There is no evidence I could find for this being historical during the European Renaissance. It seems to be more of a fantasy trope. Dual-wielding swords was done, yes; that’s even in Marozzo and Di Grassi’s manuals. But not daggers. Using paired knives is found in Chinese martial arts, but I was not able to verify what time periods it was done.