I'm a tax director in the USA. Corporate specialist, not individual expert anymore, so take what I say with a grain of salt.
Not everything you buy for work use is deductible. It has to be reasonable and necessary. So if you try to say a $5K custom Honyaki is the only knife you could possibly use for work, you may have an issue.
Home office deductions are highly frowned upon. The space has to be used
exclusively for work and on a regular basis. When I did do individual returns (decades ago) we advised our clients against trying to take this deduction because it was (at the time) the one with the highest disallowance rate upon audit. The rules have not changed in this area. (Business deduction for personal auto was the second highest disallowed FWIW).
Trying to deduct a meal allowance as "research" is questionable as well especially on an individual level. You have to eat anyway. You are a professional cook, not a professional eater. Costs of going to another restaurant to observe their technique and practices - yea ok. Costs to go to another restaurant to see how the competition stacks up - not so much so.
So good, even great knives - yep deductible. Collectors knives? I wouldn't try it on my return.
Chef's aprons and tops, yep deductible as those are not street clothes. Solid shoes because you stand all day? Not deductible if they can be worn as normal street clothes.
Here's a link for the business use of a home. Search on "Exclusive Use"
https://www.irs.gov/publications/p587/ar02.html#en_US_2016_publink1000226294
FWIW your chance of being audited is very small. The IRS is stretched to the limit and focus the majority of their attention where the big dollars are (multi national corporations and high net worth individuals). With that being said, I'm not sure (after the 2% AGI floor) it's really worth it to take risky deductions. I do have an office at home used exclusively for work, along with a computer, printer and scanner that I paid for out of pocket. That is for my convenience to save me having to go in on some weekends, so I don't take the home office deduction.
Just trying to be helpful in my area of expertise as you guys have been awesome. There is a lot of mis-information out there.