3 sounds good. The most I've worn is bag, pocket square (on pony tail or as a headband), bracelet and sometimes earrings. But usually when I wear the earrings I skip the scarf. (but they are just blue enamel circles with PH so they are pretty low key).
Especially, now that it's cool out...I sometimes do two scarves. One on Birkin etc. and one on me. I can do two bracelets, shoes, a cadena, even a sweater. I think that it's easy to wear Hermes clothes and shoes because they are so subtle. No one ever knows what brand my clothes are unless I'm in Hermes. I think it's part of the fun to be gauche every once in a while. Too much prim and proper Hermes puts me to sleep.
i am a minimalist when it comes to accessories, period. i feel like a christmas tree if i wear more then one piece of jewelry. and i count a scarf as an accessory/jewelry.
so first off, the # of accessories are a matter of personal taste and style. then, going from there, how many are from one designer i think more depends on the look of the pieces rather then the origin. for example, the collier de chien (sp? sorry) bracelet and a matching belt would show a lack of imagination. or a kelly bag and a kelly watch or kelly necklace or kelly bracelet. that's too matchy matchy. the horn bracelet like shopmom has doesn't scream hermes, and it's not flashy, so it works with a scarf and a bag. this is all just my opinion, mind you. it's not the fashion law. lol
hermes does bags really really well. their scarves are nice, but not as important to me - a scarf in general. basically, i think people should shop based on what they like, not the label attached to it. for me, everything hermes produces is not desirable.
I don't mind wearing and carrying H head to toe. RTW normally does not have the H logo and the bags just have a tiny stamp. so, its very discreet - of course, to the H fanatics, you'll be a walking H adverisement but I won't mind!