Unfortunately, you won't be able to deduct the cost of your husband's uniforms. This was previously an option, but only if you itemized deductions and had a sufficient amount of unreimbursed employee expenses to meet the threshold for deducting them.
Under the Tax Cuts and Jobs Act, you can no longer deduct miscellaneous employee business expenses subject to the 2% adjusted gross income threshold (uniforms would have come under this category).
Taxpayers can no longer claim unreimbursed employee expenses as miscellaneous itemized deductions, unless they are a qualified employee or an eligible educator. No other type of employee is eligible to claim a deduction for unreimbursed employee expenses.
See: Here’s who qualifies for the employee business expense deduction