From Next Directory, it says 1990s and I'm assuming 1995 though may have been a bit later. Prices are in dollars - the 1995 exchange rate was $1.5 to £1 sterling.
I've used the Bank of England inflation calculator.
100% cotton sweatshirt $42 : £28.00 : £59.48
100% cotton joggers $40 : £26.67 : £56.65
100% cotton vest top $14 : £9.33 : £19.82
100% cotton rugby top $40 : £26.67 : £56.65
100% cotton shorts $24 : £16.00 : £33.99
1988 was a whole other kettle of fish! The first Next Directory, it had fabric samples glued in (wonder what poor sods had that job). UK.
Linen-look blouse, 53% ramie,43% polyester £21.99 : £63.25
Blazer, lined, 55% polyester, 45% wool, £64.99 : £186.94
Pleated skirt, 100% polyester crepe, £29.99 : £86.26
Sunglasses £19.99 : £57.50
I'd say we're getting better value now. The sportswear would cost about the same today as in 1995, and the smart outfit probably not far off 1988 prices.
I imagine our below-inflation prices are due to a combination of pressure on suppliers, improved logistics and thinner margins. But should we be expecting to pay £186 for a blazer in 55% polyester?
My clothes budget doesn't change according to prices, I just buy in greater volume when they're cheaper. Then you get into the whole ethical debate about tight conditions on manufacturers & suppliers, and I don't know. It's more complicated than cheaper = worse.
It was an interesting little project, though!