Have you seen yourself retreating?*
Until today, Lady Bracknell had believed this phenomenon to be largely restricted to those of relatively tender years.
Unfortunately, she now discovers that she was mistaken.
If there is a more unpleasant sight than the rear view of a scrawny woman of very late middle age wearing a semi-transparent white linen shirtwaister frock over what is referred to in common parlance as a "thong", Lady Bracknell has no desire to be exposed to it.
(Lady Bracknell, who chooses her words with great care as a general rule, has immediately regretted her use in the preceding paragraph of the word, "exposed". As a result of that one careless choice, she is now experiencing what she believes are known as "flashbacks". Said flashbacks are not proving helpful to her digestion.)