What to wear?
Check out what your customers are wearing!
If there is a certain style then use that and do the conservative approach on it.
Beware that the customer will have different dress codes in different markets and country’s. Meaning you can be way overdressed and wearing the same outfit in another country and being way under dressed. (usually this can be quickly remedied by saying im from x and this is what we wear but i will dress more appropriate next time)
Example they wear shoes,jeans, shirt, jacket and no tie. Then go with safe grey jacket, jeans with few ornaments and no bling and make sure they are not punctured with holes in the name of fashion, blue or dark blue shirt (very conservative), shoes seems to be free in Sweden but in the rest of the world black is the thing maybe dark brown. the only place you are allowed to space out is the hanky in the brest pocket and if you have the guts 
the socks.
So why is it important that you tone down your clothing?
It makes you and your word more solid and down to earth. Hence you increase the weight in your offer and what your company stands for you will be taken more seriously and will have the added effect that customers will have an easier time taking you and your product in and making it easier for you to get the contract.
Having a sale staff with different clothing styles?
Decide what you want them to wear and make it mandatory. (buy a them the cloths if problems arise and consider it an investment).
Looking the part is an important factor to be the part!
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