I can't see your pics either. You'll get them up eventually, though, so I'll skip to the substance.

As to the question of when a pattern is too much, it really depends on the jacket and the tartan of the kilt. Personally, I like a patterned tweed on an Argyll jacket. There are some that can look horrid, or make the wearer look like a caricature, but most of them will be fine. Even the bolder ones.

I posted this photo in another thread recently, but it's my favourite Argyll jacket. I think it works well with all my tartan kilts, though there are some other tartans that it might look silly with.



Here's a photo that was posted by McMurdo a while back. I really dig that jacket, and it works well with the Royal Stewart tartan:



It will all come down to personal style and personal boldness. I think the more you wear Highland attire, the less timid you become with patterns and colours. That's certainly been the case for me, anyway. But when it comes to mixing an Argyll pattern with a tartan, you just have to consider whether you want it to complement the tartan or contrast it. Mine above seems to complement dark tartans in blues and greens. I'm wearing it with a pseudo Black Watch tartan, but it works well with my Colquhoun tartan kilts too. But you can see McMurdo's jacket doesn't really blend at all with the Royal Stewart tartan. But it creates a nice contrast.

Wearing a bold patterned jacket is really a statement of personal style.