ConceptSports, who also did Richmond's apparel in 04/05. They went under shortly after I believe.
Freo had their club logo on the neck in 2004 but the guernseys were manufactured by 'Covert Fashions'
http://www.investogain.com.au/company/concept-sports-limited
Concept Sports were owned by Gary March and Andrew Plympton, and run by StKilda board member Glen Casey.
They went broke in 2008, changed their name to Beyond Sportswear and continued trading.
Eventually they were bought out by others who have since transformed the business into something else entirely.
From what I can tell, Covert Fashion are a company with various brand names.
For instance Decjuba ladies clothing stores are owned by them
http://www.decjuba.com.au/
It appears they were one of the first manufacturers to push sublimation printed clothing, specifically into the fitness market.
It is perhaps not a huge leap to include jumpers and apparel as part of their offering.
They were replaced by Reebok a year later, a company who did not make their own jumpers at the time, and is also in the fitness market.
Who knows what actually happened to them and why, but they seem to be more focused on the more lucrative ladies fashion than sports apparel.