Pretty much the only other pant option would be to dye your own. It is really tough to find a purple pinstripe in wool. If at all.
The utopia shirt you could get by with on a budget. Its not accurate in regards to the pattern and color but the general public doesn't have a clue.
The original tie was made by Turnbull and Asser. Long sold out I would imagine. They ran about $175 I think. I got in on the first run

t:
Magnoli's tie is the only other option. Its only like 60 or 70 bucks I think and is dead on to how the tie looks on screen. The T&A one is more green colored in person.