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Can an eidolon put on a swarm suit?
These heavy and overlapping layers of clothing, coupled with a wide hat outfitted with a dense, veil-like netting around its brim makes it all but impossible for Diminutive and Fine creatures to make physical contact with your body. Wearing a swarmsuit cuts your speed in half, but gives you DR 10/— against swarms of Fine creatures and DR 5/— against swarms of Diminutive creatures.
How long would it take to put on a swarm suit?
I'd say move action. And since they don't wear armor sure.
Based on the times for donning armor, I'd say "heavy and overlapping layers of clothing" take about 1 minute to don (the same as padded armor).
A normal swarm suit is made for a biped, so if the eidolon is a biped, you're set. Swarm suits could be made for other shapes, but it would cost more, just like barding. I'd use the cost multipliers in the non-humanoid column in the "armor of unusual shapes and sizes" table right above the section I just linked to. E.g., a Large non-humanoid swarmsuit should cost 4x the normal cost.