Tax deductions for suits is not allowed, even if required for work.
From MSN money
http://articles.moneycentral.msn.com/Taxes/AvoidAnAudit/The9WeirdestTaxWriteOffs.aspx?page=2"
8. Clothes (deductions) make the man
Here's a line of thought we've all tried on at one time or another: I have to look professional at work, so why shouldn't I deduct the cost of my suits, shoes and ties? And of course that is perfectly allowable -- on Uranus!
Here on Earth, however, a less generous tax rule applies, as one of Barghini's clients found out: "I was dealing with a male model who wanted to write off his entire wardrobe because he needed to look good all the time. There are very strict rules about writing off clothing. Basically, if you are required to wear a uniform of a nature that you're not going to wear it out in public socially, such as an auto mechanic's blue jumpsuit with a patch that says 'John' or nursing clothes, you can write them off. It's basically clothes that you're only going to wear at work; you'd be embarrassed to go to the bar in them. If it's clothes that you can wear on a daily basis, you cannot write them off. Businessmen or businesswomen trying to write off their suits will not fly."