As Mick mentions in his comment, "to deem suit" is a little outdated-fashioned but not, I feel, sufficient that you mustn't learn how to make use of the idiom. I would not phone it "Victorian" English, as it is a phrase that sees typical use even today. Stack Exchange network https://beauvbhlp.blogdiloz.com/35683978/the-clean-litter-practices-uae-diaries