Several of the questions you have posed above have been dealt with on other threads, some very recently. I'd have a root around on the 'Gilded Age' and 'Fashion' threads if you want to know more.
Even the wealthiest passengers aboard the 'Titanic' would not have changed their clothes as frequently as some people believe - certainly not five or six times daily! As was customary in 1912, those travelling in first-class would have changed into evening dress for dinner (low-cut, trailing gowns for the ladies, white tie or tuxedos for the gentlemen) but, prior to the bugle call, they would simply have worn whatever they had selected from their wardrobes that morning. As I commented on another thread, there would have been little need for multiple changes of costume when the field of social activity was more or less confined to the lounge, palm court and smoking room. Hats, gloves, overcoats and furs would have been donned for breezy walks on deck.
At any one time, the Edwardians wore a far greater number of clothes than we do today and their garments were more complex and more uncomfortable than ours. Fashionable ladies like Mrs Cardeza, who were often aboard from several months each year, did indeed travel with truly spectacular quantities of luggage. A personal maid was trained to know precisely which accessories - hat, shoes, gloves - 'went' with each gown and would have laid these out, once her mistress had specified what she wished to wear that day. The assistance of a maid or valet was often essential - there were corsets to lace, collars to fix and a myriad of hooks and buttons to fasten.
I was surprised to learn that there were NO laundry facilities for passengers in any class aboard liners of this period.