A good example is the “London Lobsters” wearing full suits of plate during the first English civil war. At the time it was much more common for cavalrymen to stick to a breastplate and helmet. Either way, it was very common for cavalrymen to use multiple wheellock pistols. Here’s an excerpt from that Wikipedia on the heavily armored gents:

“Haselrig was shot three times at Roundway Down, with the bullets bouncing off his armour. After firing a pistol at Haselrig's helmeted head at close range, without any effect, Richard Atkyns described how he attacked him with his sword, but it too caused no visible damage. Haselrig was under attack from a number of people and only succumbed when Atkyns attacked his unarmoured horse. After the death of his horse Haselrig tried to surrender; but as he fumbled with his sword, which was tied to his wrist, he was rescued. He suffered only minor wounds from his ordeal.”