The gaiters have zippers making them easy to get over your boots. If I try to stretch the gaiters over my boots without unzipping them its a tight fit.

Yes, the Meru bib pant works well for skiing and does slip somewhat easily over your boots. When I say somewhat it is something I'm thankful for because I was having a problem with my ski edge clamping down on my pant leg in the middle of big turns. These pant legs barely fit over my ski boots but as long as they do, I'm okay with it.