Seconding what Phogfan86 has said.

...and, yes, do go with the sporran and if I may make a suggestion, if you get only one, get the Nightstalker nylon one while Jerry still has them in stock. They look good and are incredibly practical...I often wear mine when I'm just wearing jeans just so I have the extra capacity for stuff...you can fit a whole lot in it...phone, wallet, keys, a paperback to read in the waiting room or on the bus...it's sort of the Tardis of sporrans; bigger on the inside than it appears on the outside.

A nice wide belt helps considerably as well. It's okay to wear a nice simple "regular" wide belt but those are usually about 1 and a half to 1 and three quarters wide at the max. If you can scare up one in the two to two and a half range, it helps get the "look" just right.

And as to dealing with low temperature...remember that you always have the option to wear something under the kilt...there is no rule on this and it beats being uncomfortable. This is supposed to be fun and not an exercise in endurance.

Best

AA