Hi Obride,
Why aren't you wearing WG during dinner? Doreen Chee has advised that during the first march, we could wear the WG, then second march-in, the EG, and perhaps, the tea dress (whichever is appropriate) during the end of the dinner.
If you want a fuss-free dinner, ie, without changing into ure gowns, you can opt not to wear the WG.
Mebbe they place less emphasis on the guys' suits since they are usually OTR? For my FH, he had his measurements taken, we have already gone for our photoshoot last month. The studio and he hasn't discussed what colour he'd want his suits to be. Guess, they are quite confident to match the grooms' suits. They would have ample "stock", know what I mean?