DOS Window under VMWare

I have a client who's wanting to run a DOS application under VMWare.  However, the MSDOS window is smaller under VMWare than their monitor.  What can be done to increase the size of the MSDOS window?  I've attempted the Properties portion of the window but, in the end, that's not sufficient.

The cost to develop the application under a Windows-based environment is prohibitive at this time.

Thanks