You are probably well familiar by now with how English forms 'tag questions' ( ... aren't you? ... ), but here is your chance to practise examples in other timescales and tenses.
Don't forget that ~ unusually ~ English makes rather more of a brief grammatical fuss than many other languages do over this everyday structure: we need to switch between an affirmative sentence and negative tag (or vice-versa), carry the subject agreement right through the sentence ('He has, hasn't he?'), and even put in a 'stopgap auxiliary', usually in the form of 'do' ('It arrives automatically, doesn't it?') if there happens not to be one already available.
With this in mind, let's hope your own Answers will indeed 'be OK'!
We have set this rare example within quotation marks as it is an instance of false English: not grammatically, but in that what it says is a confusion of two separate expressions. It has been a 'household saying' within the present writer's family since ~ many years ago ~ a neighbour from Eastern Europe coined it by mistake. She was a professional lady (a pharmacist) with a son at the same local primary school as myself, where the boy had not been doing well for whatever reason, so the headmistress asked the mother along for a meeting. The gist of this meeting was then told to my mother using the wording given in the Question.
The conflation is between 'pulling oneself together' (obviously a metaphor) and 'pulling one's socks up' (also a metaphor, suggesting that someone should take a few moments to generally 'sort themself out' and smarten up their appearance, perhaps after some accident or failure). Just for once, we don't suggest you adopt the phrase as given! But it is a memorable example of well-intentioned 'broken English', and you may quietly be glad to learn from someone else's mistake. We can all learn that way too!