Sooooo close to a classic, but . . . . . . the filmmakers didn't know when to stop. Just like a great painting that could be ruined by ONE extra brushstroke, they kept coming up with extra twists and reverses to try and outdo M. Night Shyamalan and Rod Serling.
The "outfit" metaphor and double meaning was wonderful, as was the setup. The acting was superb, as was the theatrical, spare setting. The chess moves that Leonard employs were jaw-dropping and very very credible, right up to his last one, which he had planned for months.
But, when they could have simply had Leonard act on his decision to set the shop ablaze and leave, . . . They stage a resurrection. Ok. Fine. Trite, but excusable as a last gasp. Instead of having Leonard simply use his wiles as a tougher-than-expected Savile Row "cutter," to fend off this last obstacle, they reveal Leonard's Real Identity.
Unnecessary, plus it undercuts the wonderful job the filmmakers did in creating this crafty, unobtrusive "cutter." They didn't have the courage to have faith in themselves that they crafted a great narrative without using a sledgehammer when a simple shears would have done the job.