Sorry for your loss dilemma and the callous way the collection organiser dismissed you.
Does this organiser have children herself?
Sounds like she is getting clothes as the present because she wants to go out and choose them herself - either because she hasn't got kids or hers are grown up and she hasn't had a chance to buy baby clothes recently or because she thinks that she has good taste and wants to impose it on the recipient...
Whichever way, it's selfish! As everybody else on here thinks, much better to get vouchers that you can get what you need.
When dcs were born loads of people bought clothes - which was lovely of them - but there were lots that didn't get worn because they were the wrong size or season or needed to be hand washed or dry cleaned
and lots more that didn't get worn very much because everybody bought for the same size so I had loads to start with (having got a few bits in myself anyway) and then not so many for afterwards.
Some people gave receipts so they could be changed, in case you needed to change them which was thoughtful but still meant that you had to get to the shop within the timeframe to exchange them. WHich if you have an easy birth and everything is ticking along OK may be fine, but again not so easy if you are having any problems (even if it is just a baby that won't sleep so you are sleep deprived yourself).
Others didn't and whilst the thought and sentiment of the gift were appreciated, the clothes just didn't get worn.
Toys on the otherhand - only one person gave ds1 a toy and we hadn't bought many - so a nice toy was a lovely thing to get.
There are some nice toys around now that are suitable for boy or girl babies that you can get for less than a tenner - things like whoozits or little soft bear with teething or twiddling bits attached - that it is handy to have more than one of so you can have one in the car, one in the bedroom, etc etc.
Maybe suggest that they get something like that and a token pair of socks so that there is a cutsy present to unwrap and make the toy hold the vouchers. That way there is best of both worlds for the mum.
Not so good for the organiser who wants to go and get a chance to have a big spend at somebody else's expense on baby clothes though!