Like A-Line I would say the Trevek Suit. The cost is reasonable (3 to 5 CDN$ each retail at one store I just checked, and probably less if bought in bulk from a supplier). You can also get nitrate gloves if you want to keep you hands clean.
If your contract says management has to provide you protective clothing get them to order them in for you.
The house painters and body shop guys use them when spraying so a paint wholesaler or body supply shop may be the best place to try if you have to buy them on your own.
