Shirts, knitwear and suiting are wide and flat rather than bulky. The bag that suits them is landscape, not portrait.

A folded shirt is about 300mm across. A portrait bag forces it to bend; a wider, shallower bag keeps it flat and keeps the fold crisp, which is the whole point of the press and fold at the counter.
Menswear finishing tends to be restrained: matt board, a single foil or blind-embossed mark, a dark cord handle. The bag should look like the shop, not like a promotion.

A film over the print.
See this bag
Heavier board, a proper cord handle and a turned top edge.
See this bag
The same luxury construction without the film: a paper-first finish that boutiques and galleries prefer, and the easier one to recycle.
See this bagWe price the job in front of us rather than selling a package. Artwork can follow later — the quote does not wait for it.
Not sure which bag? Send a photograph of what you are packing and we will come back with the stock, the handle and a size that fits it.