Had been worn clothes ??

從來沒有「過去的過去」這個時式，更不要說「過去的過去的過去」了。

過去完成式：had worn，它的被動式就是 had been worn

你搞錯左過去完成式同被動句，我覺得首先你要搞清楚幾時用 been 呢個字先。

唔用 been
He had worn his clothes before he went to bed.
佢著完件衫之後，就走去訓覺。

用 been
He had been wearing his clothes for 6 hours before he went to bed.
佢去訓覺之前已經著住左件衫六個鐘

被動句用 been
The clothes had been worn by him before he went to bed.
件衫已經被佢著左佢先去訓覺

用咩時式首先應該睇下你重點想講咩先，重點係「佢」、「件衫」定係「著衫」。
第一句無用 been 好簡單直接係佢著完件衫即刻就去訓。第二句我仲專登話六個鐘係因為用 had been wearing 係強調緊佢已經著住左件衫，而唔係岩岩著完件衫就即刻去訓，重點o係著衫度。第三句重點去左件衫度，記住件衫只會被個人著住，而唔會個人被件衫著住，所以一定係 The clothes had been worn 而唔會 He had been worn。

如果你只係想講佢著完件衫就即刻去訓覺可以簡單咁用第一句就得。

至於你問關於用 who o既問題，主要o既用法係愛黎形容前面講緊o既人，例如 I went out with Mary who is your schoolmate. 我同你講緊我同 Mary 出去，但係我仲想話埋畀你知其實 Mary 係你同學，所以先用 who，從頭到尾都係講緊 Mary。一句句子中間用 who o既時候個 who 字就係解釋畀人知「o個個人」o既意思。

如果用返你o既例句一定要用 who 的話就係 The baby who had worn the clothes before bed is Mary's son o個個著左衫先去訓o既 BB 就係 Mary 個仔。

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沒有「過去的過去」這時式的-唯一這點要在你的思想中除去，否則你會對其他出現的past tense樣(還有其他似past tense的字)的東西誤會了。
你見到的had been worn是「過去完成式+被動句」，不是你想的「過去的過去+被動句」。
其實亦不是「+被動句」，應該理解為要寫句描寫那發生在以前的完成的被動情況，所以個動詞便要用一個被動型過去完成式來寫。