I like the way the sleeves cover her legs without covering her feet. The shirt is snug without being tight, so it doesn't bunch up or get in her way...and I think she looks cute!
Lulu doesn't get dressed very often but Ashley is another story! I'm against spending huge amounts of $$ on dog clothes however, so my favorite shopping place lately (besides clearance sales at Petco) is 5 Below. I got Ashley this Snuggie brand dog coat for $5.
I like the fact that it has wide Velcro tabs, it's so hard to hook those small ones. She doesn't seem to mind it and I put it on her a lot in winter so ease of use is super important! She shivers a lot when shes outside in the winter, so she needs a coat every time she goes outside. Plus, I think she secretly likes dressing up. lol