For summer, standard khakis should work to get you going. If you can afford more, I really like Duluth Trading Firehose Flex Cargo pants for most things. Their Firehose cargo pants for heavy labor. Other Rangers swear by Carhartt.
I prefer lighter boots. These Adidas Training Shoes are my favorite for anything that doesn’t require a steel toe.
Bugs-Try to find some that are moving slow and watch them. Most people I see with bad reactions to i sects seem to be reacting to sudden, unexpected, fast movement. Watching them slow desensitizes you and may help. And of course, sudden movement on your part just stirs them up more, making it worse. Be calm, be friendly. This also applies to 6 year olds.
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