What's the word after Gucci and Hermes?

Solution 1:

The word is "line", it is short for product line which the Investopedia website defines as

A group of related products all marketed under a single brand name that is sold by the same company.

"The next Gucci and Hermes lines" are the absolutely latest collections of clothing and accessories from those fashion houses, by implication so new that they are not generally available.

If you're into that sort of stuff you'll be impressed that the people with those items have both the wealth and connections to obtain them. If you're not into it you won't know, won't notice and won't care.