In Cathay Pacific (aka Cathay Pathetic Airways) uniforms for simulators was required - but then again what would you expect from a draconian outfit. I thought this was more of a Pommy thing - itīs hard to believe the Frenchies are going to implement such a concept in their training. To make it more realistic is mentioned a few times. Itīs a simulator - itīs not an airplane - wearing a clown outfit wonīt change that fact. Itīs a training tool. Youīre there for training and hopefully to learn something new or be reminded of something you forgot. Line checking is where you where your uniform, check the notams, call the weather man, ask for your tea and biscuits etc..