Sorry Just skipped over your comment about best shoes to use but I would advise boots be used during any work operations.

Most comfortable work boots for concrete are wedge soles. You can get safety or soft toe depending on your job requirements. Right now I’m loving my redwing traction tred lites. Used them this past summer during road construction and loved the extended comfort that they provided.

Another brand that makes great wedge boots is Thorogood.

Wedge soles do not last as long as hard tred soles because they are softer but it’s well worth it imo.

Also, no boots are BIFL but the closest ones you could get are from Nicks Boots. They make a wedge boot built like a tank that you can resolve probably 2-3 times

With the conditions that surveyors deal with (branches, uphill, bending over) it’s hard to get light weight pants that last. Maybe check out 1620 USA, truewerk, or Duluth trading comp. They give you some different options between heavy fabrics and lighter and more comfy pants.