Any advice on what i should wear to an engineering conference? Don't really want to dress like a fool and feel unconfortable all day.

I can only speak about attending computer science conferences but they are very informal, sometimes the speakers dress more formal but everyone else wears what they want. In saying that I know science conference attendees are usually well dressed. You could try asking some other students in your department to see what they wear!

If you're presenting, oral/poster then dress smart.
Otherwise semi-formal is the norm for science meetings. This is a good place to network therefore not too scruffy!

I think it does tend to vary with the field so ask your supervisors/post-docs/fellow students for advice. However, my experience is the same as Jeremy's i.e. wear something smart on the day you present but it's usually fine to be more casual on the other days (especially if your conference is somewhere hot!). Have fun! :o)

Thanks for the advice, i think i was thinking along the right lines. I'll have a word with my supervisor if i can track him down tmrw.