This would be for general clothing (not special things like coats and trainers) the odd lunch out etc. Not phone (we pay for that separately). He earns £65 a week on Saturdays so we expect him to save some of that and spend the rest on nights out etc.
How much would you give him monthly. We aren't badly off but not in a Mumsnet "scraping to get by on £100k a year" family either.