So here's the deal. My daughter is just about 3.5 and I've been making her size 4. She isn't very tall (38") but she's solid (not big, just not a rail). Size 4 tends to be a tad big (usually) but I'm fine with that as it will fit her for more than a minute. My problem is there a bunch of patterns I want to buy, but I don't know whether to move up to the bigger size range or to buy the smaller one. Is it easy enough to size down from the 5? I'm not good at modifying patterns, but I also want to make sure she can wear it before a year from now. Any advice??