Ring bearer attire dilemma

So my son is quite tall for his age! He’s 16 months and fits in anywhere from 24months to 3T just depends on where we are getting it from! And for shoe size he’s 6T
My wedding is in September.. so will he grow 2 sizes up in shoes and clothes in 200 days? Hard to say lol
The only site I’ve been able to find what I need is Etsy. ( black dress pants, white button up, brown suspenders and bow tie, brown dress shoes) I wish I was able to find what I was looking for in store that wasn’t too expensive, my budget it 250 for him. I’ve talked to Morres and they don’t have what I need, so do I get the 2T on Etsy and hope it’s not too small lol , they take a couple months to arrive so I have to order a bit in advance