Fun fact / trivia: a real spy / foreign intel agent would've had a clip-on bowtie.
From a realistic tactical perspective, and anyone with military & law enforcement experience knows this, Bond would've been issued a clip-on bowtie. Or he would've thrown it away for a clip-on. Does anyone know why? Trivia answer below.
Answer: in a use of force situation, especially where close quarters, unarmed combat is a concern, bowties and ties are a huge, serious strangulation point/hazard.