The little top is the Skipper Sailor Shirt (Ottobre 3-2009-13). Like the matching dress, it is small but seems wide. Maybe it won't look wide on small, round baby Lucas. I used a nice crisp cotton sateen for the collar - it was the only white fabric I had on hand besides batiste and happily it's the perfect weight.
And the shorts are the Ahoy Baby Shorts from Ottobre 3-2009-13. They have a mock fly front and a back yoke. Both the top and shorts are made of chambray from fabric.com. I used so little of my yardage with these tiny garments, I have plenty left for whatever I was going to make in the first place.