I wonder if you can get someone to make one with a leather flap that covers the attachments?

I've had quite a number of armguards over the years with different type of connections. I've never had any problem ever with
catching my clothing or now string even shooting a longbow at some extreme cant.

I have found I only need them when wearing bulky clothing, but I too want nothing with large buttons on it.   

I am glad to see all the comments.  I just wanted to restate the point that my problem with the attachments on the underside is related to sitting and having my arm resting on my leg/lap. Then, if/when I move my arm it is not unusual to catch or tug on the cloth and either make an undesireable sound, distract my attention, or require a larger movement to undo the hangup.  When standing or day-to-day shooting, I don't see a problem.  I  do have to say that elastic cord revolutionized the whole thing. My first armguard was like a "bracer".  With small brass hooks and a long leather lace it was functional, but a little bit difficult to make adjustments once "strapped in".  I was not unhappy when elastic cord became the way to go. 

They can also protect you from a broken Carbon arrow going through your arm. I have seen it.

Yikes!  And I thought that rough fletching tearing up the web of my bow hand, a big welt on my forearm, and debree splashed back in my face was all I had to worry about when I shot my arrow. Not counting losing the arrow, breaking a shaft with another arrow strike, and having to replace the broken nock or a lost arrow was ALL that I had to think about.  I probably won't stop wearing an armguard after hearing that last one.  And I wear glasses anyway   

I had the same thoughts about arm guards. Came up with this design;[attachment=1]

It's not perfect, but it does not hang up or grab stuff. The bungie straps are probably a better solution, but I hate anything elastic, so that was not an option for me.

Interesting  and very nice.  Thanks for posting