Although I have never actually seen someone wearing a RLBL suit in person, that could be because I live in a city with little access to RL. But I think its because a) those suits look terrible on the majority of people, and b) they are insanely expensive.
Seems like a modestly well made suit tailored for a 17 year old (or an anorexic 20 something). I did love the RLPL suits. Slim cut but still could be worn by real people and of wonderful fabrics and construction. I am not certain that I love the lack of belt loops but the fabric and cut are wonderful.
It's because of the limited availability of them. I've got 3 RLBL suits and I'm VERY happy with the cut of them. I only wish they did more fabrics instead of the basic dark colours and the pilling that happens on the inside of the jacket is kinda weird. It's like the canvassing on the inside is coming out.
An interesting note about gabardine suits. Gabardine doesnt breathe well, it has little elasticity, It's heavy and makes you warmer in warm weather and the fabric gets cold in cold weather. Gabardine is a uniquely worthless suit fabric for the wearer. It has a certain creamy look to it but it is strictly for masochists. As spring or summer pants it works quite well.