As much as I would agree, but the original poster was only asking a simple question about some information. There is no need to assume that he/she is “hung up” on such things.
On another note, cassocks bear a great symbol of humility and charity, just as you would expect a monk to wear only his robes; it is his life, he is a priest and he should live in such humility.
Contrary to that, there is an italian phrase; “il habito non fa il monaco” that is “The habit doesn’t make the monk”, and frankly, if someone were to be interested only in cassocks and vestments, then the Church knows how to recognise that.
I would add however, that an interest in vestments and clerical clothing is still good. It is well within the tradition of Holy Mother Church to say these things are important and valued.
To the original poster, L Marshall has it all correct. Generally, on a day to day basis, the clerical shirt is worn.
For anyone that is interested, here is an excellent video someone from the NAC shared with me last week on Facebook. It’s “A Day in the Life of a Seminarian” at the NAC: facebook.com/photo.php?v=872748299409170
God bless! :gopray2: