DS at 11 years old was considerably cheaper to keep in the style with which he eventually became accustomed.
His 1st mobile phone was less than £100 to buy outright, but would have been the equivalent to a mid range smart phone now.
At secondary school, he was happy to wear high street brands, Nike, Adidas, Kickers shoes, and he was more than happy to wear Lynx spray and aftershave that was at the cheaper end of the market etc, but as he moved up to college, this changed to more expensive branded clothing from Blue Inc, aftershave such as Diesel etc. This coincided with him wanting driving lessons and a holiday abroad with friends for the first time.
Now, at 22, he spends a colossal amount of money imo on clothes, and despite not having many items of clothing, they are imo expensive items although not always necessarily great quality, it's all in the name as his friends do too. I bought him a Fred Perry T Shirt for xmas which cost £40, for 1 T shirt and he does wear it, and he wears his Roberto Cavalli items too, but I have never seen him wear his ASOS tops that DD gave him. Maybe ASOS are not cool enough. His jeans which inevitably get trashed regularly and as a result I do not buy for him anymore are at least £100 a pair. It is disheartening to see him wearing those jeans for work after a few months of buying them.
His last bottle of aftershave was almost £70!! 
As I said before, DS pays for the majority of these things himself, I only treated him at xmas and birthdays and bought his car himself, but I know for a fact that despite trashing his jeans regularly, he looks after what he has bought with far more care when he has paid for it himself.
How any parent of a uni aged DC can afford to shower their DC with these items and cars and driving lessons, and activities, and tuition fees and spending money is frankly beyond my comprehension.
It is also beyond my comprehension how any parent believes providing the luxury items is part and parcel of being parent to a fully grown adult. Surely your DC understand that these are huge sums of money to be spending on unnecessary items??