Trousers tailoring advice

[alghul]

Hello,

I am about to bring these pair of trousers to the tailor. Never really paid much attention to trousers before (minus the hem) so I would welcome some advice on the fit and what alterations are required.

The grey are flannel and the navy are twill.

Both are too long?
Too loose at hips level?
Both bag near the crotch when I sit. Reason?
What else?

Thanks