I'd say that when you're buying a $1000 t-shirt, there are around 3 different options:
1) High-fashion brand item. This is usually a middle-of-the-road item with steep designer markup. Gucci, Tom Ford, etc.
2) Collector item. It could be a $5 shirt which has suddenly become very expensive due to collection-value. Supreme, etc.
3) Hand-made small scale luxury brand item, using rare materials (Vicuña blends, extremely fine wools, etc.). They still have a markup, but more justified than those in 1). Loro Piana, Stefano Ricci, etc.
1) High-fashion brand item. This is usually a middle-of-the-road item with steep designer markup. Gucci, Tom Ford, etc.
2) Collector item. It could be a $5 shirt which has suddenly become very expensive due to collection-value. Supreme, etc.
3) Hand-made small scale luxury brand item, using rare materials (Vicuña blends, extremely fine wools, etc.). They still have a markup, but more justified than those in 1). Loro Piana, Stefano Ricci, etc.