Don't be discouraged by these comments by guys who fly regularly. Statistics show most new PPLs stop flying regularly soon after gaining their PPL, and then stop flying at all. They, and MS pilots, may welcome a range of clothing to show they are pilots, and may be willing and able to pay value-added prices for them.
There might be a market for your designer range.
If your trousers are better-wearing and cheaper than Asda's £5 jeans, I might consider them.