I think that it's episode 157: Destroy Naraku With the Adamant Barrage! I like this episode too.
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That epidoe is called "The Backlash Wave: Tetsusaiga's Ultimate Technique." It's the second episode of Inuyasha's battle with Ryukotsei.
Episode 97 of Inuyasha: Kirara, Come Home! doesn't actually say when InuYasha practices the Wind Scar on Kirara, but from looking at the flashback when Shippo points out various things Inuyasha has done to Kirara; this leads me to believe that this may have happened in Episode 36 of InuYasha: "Kagome Kidnapped by Koga, The Wolf-Demon".
Sesshomaru demonstrated it to Inuyasha and during a battle when Inuyasha was blinded he learned to use his other senses beside his eyes and "feels" the two wind "paths" blending together creating a wind scar, he strikes it with his Tenseiga and bam the magic happens. :)
yes,in episode 168 of shippuden
Sakura was in a nurse uniform in episode 213 (filler).