The Murillo area is fabulous for shopping, but I find the people who work at Murillo 666 to be consistently rude. I happened to be in the leather district today and walked in to see if they sold men's gloves. The woman I asked rolled her eyes, continued slumping against the wall, and shouted "vendedores!" until one of them shouted back "ocupados!" I rolled my eyes right back and walked out. I'd way rather give my business to someone who actually wants it!
Meanwhile, in terms of custom fit, almost all of the stores will make any alterations you want for no extra charge, and many will even deliver it to your house, also for free.
Today I went to pick up a jacket I bought from Murillo 626 - fabulous store! I wanted the pockets adjusted and they made me a completely new jacket with new pockets and even put in an interior pocket at my request, same price as the original.
I also really like the people and the prices at En Kueros, Malabia 12. They do custom adjustments for free as well.