But the question really is a 'how long is a piece of string' question because budgets and priorities vary so hugely.
It would be ridiculous for a SAHP on a tight budget to spend £200 pm on clothes, because it really isn't necessary and it is very likely that the money would be needed for more important things. But it might be reasonable for a well paid professional in an industry where looking smart and groomed is an expectation.
If you have no savings and are frittering money, then you should spend as little as possible on clothes, think £50 pm or even lower. Wear the ones you have, use charity shops, outlet malls or ebay, only buy what is absolutely necessary, not just because you fancy something new. So there's a big chunk of money there.
You say you have £1000 pm, but have you cut your bills and food as much as you can or are you also overspending in that area?
If your idea of normal basic shopping is organic everything from Waitrose and are spending £200 pw for example, that could be cut down considerably by eating a more basic diet from a cheaper shop. Do you buy lunch, coffees etc or take a packed lunch - people can spend hundreds of pounds a month like this without thinking about how it's a luxury or can be cut down.
The moneysavingexpert money makeover is a good place to start, but you need to question every expenditure, large and small, but without seeing the details of what you are spending, it's impossible to say what is reasonable, or what you can cut back on.
www.moneysavingexpert.com/family/money-help/