Fairy Tail (2014) | Episode 19

Natsu is still locked in a desperate battle against Future Rogue, who is controlling the dragons to facilitate his plan for world domination.

The dragon Zirconis uses his unique magic to literally strip the "dignity" (clothing) off the soldiers and wizards, including Lucy and Wendy, creating chaotic and comedic scenes amidst the serious war. Fairy Tail (2014) Episode 19

Titled "Zirconis' Magic," this is a "canon" episode (Episode 194 overall) that is part of the major Eclipse Gate storyline. Natsu is still locked in a desperate battle