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as the others were already stating, it always depende on the client, the situation etc. If you are not with the client, the dress code in consultancies is often very casual. However, when being with a client it really depends on the client and your colleagues and the consultancy. If you feel really uncertain why don't you just ask your future colleagues beforehand?
To be safe, go the bouse option until you can get a reading. Some of the consultants i have seen dress fairly casual...but it's better to be overdressed than underdressed.