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^^^^ This.If I were styling you, I'd happily give you a 35 retourné to carry in hand (as others have said strap just for occasional assistance). A selliers looks bigger than retourné and also, don't forget a bright or light colour will also make a bag look bigger and dominate the outfit.
35 was the quintessential classic size until more recently and the usual choice of Grace Kelly. With casual clothes and the fashion for smaller bags it looks large by comparison, but if you wore more formal clothes and were carrying it buy the handle I think you wouldn't doubt at all that you were carrying the bag and not vice versa. If the 35s in those colours mentioned you're thinking of buying are retourné I think they'll look fine.