As Mick Mentions in his comment, "to deem suit" is somewhat outdated-fashioned although not, I do think, adequate that you shouldn't find out how to use the idiom. I would not simply call it "Victorian" English, as it's a phrase that sees common use even nowadays. Pulsatilla: May possibly help https://maps.app.goo.gl/JU7hwR6FT2pvRxCo6