£200 a month is easy. I have admittedly lost weight this year so eg. had to buy new trousers and dresses that fitted.
Admittedly I've not committed to anything in Dec, there may be a pair of shoes bought but I think that will be all. Oh, and a haircut £45.
But for example last month (Nov) I bought a dress for my Christmas party £119 plus ~£50 on alterations and new party shoes £99 in the sale but reduced from £179 so I could have spent even more. Also a pair of cheap jeans £25. And a haircut £45. Admittedly the party dress won't be worn much but the shoes and jeans will. £350 in a month.
Oct I bought a new pair of ankle boots £99 and a jumper £25. Also had my hair cut £45 so just under £200 in a month on things that are basics that are worn all the time, I've worn the boots at least once a week since I bought them and the jumper will keep being worn until it wears out, probably worn it every second week at least since it was bought.
Sept I splurged on the new season since I'm now 2 sizes smaller than I was last winter. So, deep breath: trousers £39.50, belt £19, dress £59, top £59, cardigan £78.40, jumper £84, blouse £56.25, belt £20, skirt £35. £450. Some reduced (there are some cashmere bargains there) but not all. Apart from the skirt which is very much a fashion item for this winter everything was plain neutrals for work and has been worn lots and will be worn until they get worn out or possibly out of fashion (by that I mean in a few years).
You'll be glad to hear August was just £6.50 on a sweatshirt and a haircut £45.
I do think people underestimate what they spend unless they are on a budget or record what they spend, I certainly did. And an increase in budget just means more expensive shops, I'd love to be able to afford some designer stuff but £100 is kind of my limit per item except shoes.