mtm shirts (collars)

[smk]

Hi
I recently discovered differences collars make and mtm clothing in general.
I was wondering mtm shirt places do custom collars for the shirts. I've learned that face shape and size determines what collars looks the best on a person.
Do they have different types of collars and adjust the collar height, size, etc?
And does anyone know a good place around DC?
Thanks in advance!!!