Not sure about your post and your point. If the web site has the item listed as available, and the OP was able to complete an order, then it's on the company if they didn't have the inventory to fulfill the order, regardless of how close to the hunt it was.
This is especially true if the company failed to reach out and explain why the order was cancelled: bad customer service in my opinion.
Sometimes things happen. At my store inventory is never 100%. Our website might show something in stock and we can not find it for the customer. I try my hardest to find an item if it shows in stock, I will try to order from another store, or I will try to find a suitable alternative.
Sometimes items have been checked in at freight and are not on the floor yet and could be in the middle of a pile of boxes and crates on pallets, items might have been returned but are defective and have not been taken out of inventory, an item might be in inventory because customers have the last ones in their carts and have not checked out yet, or I have seen similar items checked in under one SKU when someone in freight did not notice a difference. Then it shows inventory in one item and not the other.
I have seen turkey decoys come in damaged. They are placed in inventory and it takes a minute to remove them. Customers can place orders or travel to the store with us showing inventory. I have seen carbon fiber climbing sticks recalled. We show inventory for a day. Customers come in and we can's sell them.
To be upset enough to turn to the internet for a cancelled order is a bit much. We will probably not get a follow up from OP if he does contact Sitka. We will not hear from the company as to why the order was cancelled. We just get one side.
OP said he ordered intime for it to get to him. If you are leaving just enough time for it to ship to you that is last minute. They might have had 50 customers order the same item last minute. Might have been a timing issue.
It seemed like the first thing done by OP was to turn to the internet to complain. No mention of contacting the company to see what was up or how the situation could be rectified. Just mentioning that his hunt was ruined for want of one garment. We do not know what the communication was between OP and the customer. OP does not say if there was any email of if he reached out to them.
I doubt his week was ruined because he had to go shopping. He said he bought the bibs last year. I wonder what he wore last year and why that is no longer an option.