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Borrow stuff to wear from friends/family
Borrow stuff to wear from Kitted Out, whole family can benefit
Wear something you already have, if you are wearing a robe, no one can really see it anyway
Buy very cheaply, either 2nd hand or try a low cost shop e.g. Matalan, Primark, Tesco, Asda, New Look where you can get trousers, shirts, dresses, shoes etc. all in 1 place and v cheap. This can then double as interview clothing
Have a picnic or BBQ if it is a summer graduation
Have a Bring Your Own party, where each guest brings a little something
Use vouchers/cheap deal sites to eat more cheaply
Join up your celebrations with another graduate to spread the cost