Warehouse work could really take a toll on the fabric. I understand the want for wearing a kilt in that environment, but you would be best served to wear one of two options.

1). A UtiliKilt... which will stand-up to ANYTHING that you can throw at it, or
2). A poly/viscose kilt which will wash-and-wear, and is lighter in weight for comfort.

I would not buy an "Economy" if you don't have to with the StillWaters. The "Standard" kilts are heads-and-tails better for a few more bucks.