In every wardrobe, regardless of style, should be plain t-shirts. It is absolutely indispensable thing, which is very convenient to change and use when combining. In this case it is not necessary to buy expensive brands, you can buy quality t-shirts at budget prices.
Strict office pants is not the case when you have to invest a lot of money. Now a large number of budget brands that offer items of good quality. But in "working" best places to invest. For example, the top of good material, original prints will always attract more attention than a strict conservative bottom.
When buying a "working" bag is better to be guided by the convenience and functionality than trendy style and print. You just have to imagine how uncomfortable to put documents in a small bag "messenger" or digging around for your phone in the huge "trunks". In this case, one high quality classic handbag with not too flashy design and neutral color.
Ballet flats are back in fashion. But only shoes without heels wear out much faster than the heels. And so best to walk to the shops with average prices.
Classic sports wear the same color looks exactly the same regardless of what the money invested in it. In this case it is better to consider budget options, but do not forget about quality.