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Reiss outlet is always worth a look. This is tweedy but lighter weight and on sale. And if you like chinos but want something lighter weight check out some of the golf
clothing brands like Lindeberg or Oscar jacobson. I have a couple of pairs and rate the Lindebergs. Smart enough,cool,comfortable and have zero Golfy branding
https://www.reiss.com/style/su061369/m47938#m47938
https://www.jlindeberg.com/en-gb/products/chaze-gmd-stretch-pants-batique-khaki
Desert boots are probably perfect for this tbh. What kind of budget are you working with? A suit that fits properly, made in a nice fabric, perhaps with a soft shoulder, should be incredibly comfortable.
Purely an example but this is linen. Photos 5, 6, 7 could be a good look.
https://natalino.co/products/sport-jacket-blue-tan-check-linen-cotton