Next season is all about tan and light grey for suits, dark brown is pretty dated. Also, if you have a three button suit, remember to only do up the top two buttons. If your shirt has thos extra cuff buttons slightly further down, they should only be done up when you're wearing the jacket, they're there to make sure the cuffs show out of the sleeves.
If you don't already own a tie, I'd avise getting a plain rather than patterned one and in a dark colour as that's more likely to go with a variety of shirts. You can get away with wearing the same tie pretty much all the time if you have a variety of shirts to match it with.
Wear black socks and probably black shoes. Generally though, for an interviwe so long as you look smart, you're unlikely to get overlooked for lacking sartorial flair. If it's a research lab, I'd have thought it unlikely you'll be wearing a suit from day to day so don't spend a fortune on one. If you one day decide you do want a nice suit, there are a number of websites in Hong Kong and China where you send them your measurements and they tailor make one for a fraction of the cost of a bespoke suit in the US or UK.
Jam it back in, in the dark.