Answer:
The phrase "the next warm Weather, naked" adds humor.
Step-by-step explanation:
In these lines, Franklin recounts a story that does not seem very logical. He talks about a witch trial, and he tells us that some women were being tried for witchcraft. However, he also tells us that people believed these "witches" were being "supported" by the "shifts and garters" with which they were bound. This is an absurd notion. Franklin build on this absurdity by presenting an even sillier scenario: that the women were going to be tried naked the next time there was warm weather.