>>18526649
You can buy decent chinos from Amazon anon. Not even kidding, the Amazon Essentials brand ones are nicer than the normie slop from GAP and Old Navy. A real mature retro chino adult men like your dad (or math teacher) would wear.
Just don't buy super cheap shit like Wal-Mart's George brand because the crotch will blow out the third or fourth time you wear them. Also don't buy on Temu or Shein because the item you see is never what you get except for the rare honest seller.
Plenty of decent linen slacks online. Fashion Nova sells some for really cheap, be warned though they're not pre-washed. Other than that they're solid for the money.
If you can, thrift these things and look for to find some decent brands like Arnold Palmer, Dockers, and Dickies (look for vintage). Vintage CK and Guy Laroche are options too.
>>18526808
Ralph Lauren is lower middle class quality at upper middle class prices. Same with Hugo Boss. Unironically my Calvin Klein stuff is better quality than my Hugo Boss. Guy Laroche is also solid for cheap if you can get vintage or clearance goods.