I think Masumi is the only one who took pics in a yukata.
He talked about in the Mind Spell some days ago. He didn't said that the others also took those pics.
But I know that they were wearing yukata for one concert in summer.
窶堋?ﾂ、Zy窶堙姑棚ﾆ棚ﾆ地ﾆ停?ｰ窶堋ｳ窶堙ｱ窶堙娯?ｹLﾅｽ窶凪?堙姑坦ﾆ陳?停?愴暖窶堋ｪ窶堋ｿ窶堙･窶堙≫?堙??ﾃｰ窶堋ｵ窶堋ｩ窶堙≫?堋ｽ窶堙按≫┐
窶堋?窶堙娯?愿ｺ窶堙固ｽB窶ｰe窶堙坂?板⇒?溪?堙?、窶吮?ｦ窶｢t窶堋ｯ窶堙??堋ｩﾅ?m窶堋ｩ窶堙俄?佚･窶｢ﾃ鞘?堙??堋ｵ窶堋ｽ窶堙?窶堙ｱ窶堙仰。
ﾆ谷ﾆ陳?停?ｰﾆ筑ﾆ停?懌?堋ｳ窶堙ｱ窶堙｢ﾂ、ﾆ陳?辰ﾆ誰窶堋ｳ窶堙ｱﾂ、ﾆ断ﾆ旦ﾆ辰ﾆ段ﾂー窶堋ｳ窶堙ｱ窶堙?ﾂ鞘?ｰ窶堙溪?堙??堋ｨ窶ｰﾃｯ窶堋｢窶堋ｷ窶堙ｩ窶｢ﾃｻﾂ々窶堙遺?堙娯?堙可親ﾂ静倪?堙俄?堋ｵ窶堙??卍ｸ窶堋｢窶堙??ﾃｰ窶堋ｵ窶堋ｩ窶堙≫?堋ｽ窶堙??堋ｷﾂ。
ﾂ債｡窶扼窶堙娯?ｰﾃ??堙固ｽv窶堋｢ﾂ出窶堙娯?啀窶堙や?堙??堋ｷﾂ。
窶堋ｱ窶堙個湘ｪ窶堙ｰﾅｽﾃ倪?堙ｨ窶堙?、窶堋ｨ窶氾ｧ窶堙ｰ窶堋ｳ窶堋ｹ窶堙??堋｢窶堋ｽ窶堋ｾ窶堋ｫ窶堙懌?堋ｷﾂ。
窶堋?窶堙ｨ窶堋ｪ窶堙??堋､窶堋ｲ窶堋ｴ窶堋｢窶堙懌?堋ｵ窶堋ｽﾂ！
That's the passage from the Mind Spell.