Many companies have relaxed their dress codes. Casual dress may be appropriate on Fridays or formal dress may only be required for meetings with staff management or customers.
The number one rule for casual dress is to observe what everybody else is wearing, especially the bosses. "Casual" standards may be different for each company. Standards of dress may be more relaxed at times but good taste and good grooming is always the standard.
To change grooming and appearance to fit the needs of your new employer may require new habits and planning. These changes may take resources, new actions and planning, but can be done over time. Set a goal to do this for your personal satisfaction and career success.