Should I invest in a full stash?

Advice please! We are currently part time cloth diapering because I was too nervous to invest in a full cloth stash, and only have enough for 1 day. So I currently have lo in cloth every other day. She is currently 9 mo, and I really like the cloth. We do Alva pockets. So here's my problem. LO is quite a chunker. She is 25 lbs. The Alva OS pockets go up to 35lbs, but she is on the last snap for her thigh, and even then it's snug. I know Alva makes a bigger diaper, but It's more expensive, and I worry that it wouldn't fit under her clothes. She will probably walk soon, and thighs will slim up but still, is it too late to invest in a full stash?