Everyone is different, and there is a collar for everyone -hehehe!-
Personally, I like to have a day collar and a play collar. Working in a professional industry, my fluffy pink studded collars, and heavy duty leather o-ring collars would...-ahem ahem-stand out...to colleagues and administrators.
When I'm at work, I like to wear a piece of jewelry that symbolizes my commitment, and blends into my attire. A lace choker, a long wrap-around necklace, a set of matching bracelets, etc...
Here are some links to vendors on etsy that provides some really tasteful pieces that are suitable to for the workplace, casual settings, and even formal events:
https://www.etsy.com/shop/ErosMoon?ref= ... d=13178867
https://www.etsy.com/shop/MySecretHeart ... eader-name
If this is too expensive, I have found day collars and cuffs at department stores such as Ross and TJMaxx in the past. It all depends on your imagination and perspective!
Happy hunting! -Dolly