I'm with Baer. I think when you ask "What size mat do you want?" you have just added 3-5 unnecessary minutes to a process that most consumers hate, anyway.
I know, I know, all your customers love the process and would spend hours needed. Not ours
Two problems with 4" sized samples:
The exact same response as Sharon-Wow, does it need to be that large? creating the aforementioned 3-5 minutes of unnecessary process
and,putting down a 4" sample with a 3" sample as a top mat (see: 3-5 minutes of unnecessary...)
I have to suggest that we just never seem to have much problem simply advising the proper size mat (according to us, anyway). Didn't have the problem with 3" samples, don't have much of a problem 4".
On a staff level, most of the designers think the 4" samples are not as easy to handle, to fan out, etc. Something about their hands being smaller and more delicate. The female designers say the same thing (c'mon, folks, that's humor for me anyway)
4" or 3"
Chop or length
Boxers or Briefs
The list goes on
If the intent is to sell wider mats (and as the argument goes, bigger frames, larger glass, etc) then simply set the default on mat sizes on your POS to a larger size.
98% of your clients rely upon your judgement, don't they?