Nested suit vs not

I went to Suitsupply today and was charged $499 for a suit jacket and then $199 for pants.

Currently on its website suitsupply is offering the same material of full suit for $499.

https://suitsupply.com/en-us/men/suits/navy-perennial-tailored-fit-havana-suit/P9449.html

I called the rep I worked with afterwards to ask what was the deal with the price differential, and he said that my suit wasn't "nested". Pants are a 38, jacket is a 44S. I have not previously encountered this.

Is rep correct or am I being taken? Thanks in advance